Wow, some of these answers seem well off the mark. Either that they're basing their theories on the book (which I never read) but watching the film I can come up with a different theory based on the onscreen adaptation. She chose this woman because she knew she would let her be an adult. Astrid was on the cusp of 18 and nearly ready for independence. With Rhina and the other two girls she lived in quasi dorm setting. She got to party, drink and she was left to make her own decisions.
She didn't have a religious busy body down her throat with Christianity and she wasn't locked in a ward or with an emotionally unstable woman. She was finally free to be whoever she wanted and to experiment.
Plus Rhina taught her a few things, one of those things was to let go of the past and the other was to confront her Mother and maybe get some financial help for art college and her future. Rhina was shady but wise.
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