Even though Sarah Jane was an ungrateful brat, her motivation made some sense.
We should never hide who we are, but when being yourself means being less in the eyes of the society you live in and seriously limits your options in life, well that would be a tough choice.
Being a kid and young woman, I can see it being easier for her to just pretend to be white. And growing up with so little, I can see her wanting more.
She treated her mother awfully, but I think that to her Annie represented the life she didn't want, so she pushed her away and distanced herself. In her mind she couldn't have her mother and the place in society or the life that she wanted.
The saddest part about the film was that she lived in a time and place where she was forced to make that choice in the first place.
I agree that it would be a very tough choice, and I think most people in that society who appeared not only white, but very beautiful on top of it, would have been at least tempted to seek out the advantages that life would offer them. I see Sarah Jane as a very tragic figure. She can't reconcile the self she sees in the mirror with the ethnic identity she is born with and which her mother is trying to instill in her.
In reality, the choice of "passing" also comes with many sacrifices...friends, family, the mental peace of living in truth...all must go, and would probably leave someone lonely and unhappy, and always on edge for fear of discovery. That's what Annie was trying to protect her from. But in the heat of a society that hates her for a racial identity she herself doesn't want to identify with, Sarah Jane can't see that.
The way she treats her mother is terrible, but it was because she wanted so desperately to be the person she thought she wanted to be, misguided though she was...and Annie held her to that other person inside she wanted to forget.
Sarah Jane, particularly Susan Kohner's interpretation of the character in the 1959 film, always makes me think of actress Merle Oberon. Oberon was most likely of mixed British/Eurasian/Ceylonese/Maori origin, making her easily the most multi-ethnic movie star of her time, and perhaps the first ethnically non-european to really be a full-fledged international movie star. Very beautiful women of non-white descent could be successful in films at the time, but usually in supporting or "character" parts, or as seductive, distinctly foreign "other woman" type counterparts to the white leading ladies...the sensational Chinese actress Anna May Wong, for example, became a minor screen icon doing this. But Oberon was a hugely celebrated, top-billed star in Britain and Hollywood in the '30s and '40s.
This was the life Oberon wanted, but in order to attain it and hold onto it, she had to sever ties to her family, and lie about her parentage and birthplace. In fact from India, Oberon claimed to have been born in Tasmania, presumably to white colonial parents. She deliberately obscured her past until the very end of her life, when she finally admitted that the Tasmania story wasn't true. In India, she was ostracized by classmates at her posh, white private school for her parentage, and an early boyfriend dumped her when he saw that her mother had dark skin. When her brother attempted to contact Merle in Hollywood, she refused to see him. She did continue to live with and care for her mother, but told any who asked that she was a maid. After her mother's death, she commissioned a portrait of her, but asked the artist to lighten her mother's skin tone. The woman Merle knew as her mother was in reality most likely her grandmother (her real mother gave birth at 12). She was one of the best stars and greatest beauties of her generation, and I admire her immensely, but I can never forget the tragic way she obtained phenomenal fame and fortune at the cost of living a lie for her entire life.
This story was dramatized by her nephew in a novel, and popular TV miniseries "Queenie" in the 1980s. Unfortunately, I haven't read or seen it.
Not to get too far off topic here, but don't know if you're familiar with Merle Oberon's films or not, but if you aren't I heartily recommend her. Her most popular film is Wuthering Heights from 1939, one of the all time greats, but my personal favorite performance by her is in the smart, colorful comedy The Divorce of Lady X, and I think she is most beautiful in The Scarlet Pimpernel. Here's one of my favorite pictures of her from that movie:
We should never hide who we are, but when being yourself means being less in the eyes of the society you live in and seriously limits your options in life, well that would be a tough choice.
As a white man with a biracial daughter I know that perhaps if she had grown up in that era she might have wanted to try to pass. I would have strongly advised her not to and that she shouldn't deny a part of herself and to be proud of who she was but if she felt that's what she had to do I would have reluctantly accepted it but told her like Annie did to Sarah Jane in their last talk, that if she ever needed anything to come to her and she would always be there