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I thought, in the beginning, that she might be a figment of Winter’s imagination, his mother as she would be when older. Some viewers were disappointed D was real so I figured they might throw one in this time. It was clever to make Winter somewhat of a recluse so that it could work. We hadn’t seen her speak to anyone else at that point and Winter’s words to her, “You’re not her, be glad of that” could suggest that she is a version of what he would prefer his mother to be. But that changed when she started interacting with other characters.

We’ve seen Winter’s mother in the psychiatric facility although it could turn out she isn’t his biological mother. Or maybe Lindsay is a doting aunt, trying to make amends for her sister’s evil deed.

I think imdb have shot themselves in the foot. And yes, they’re often slow to put up details or even have wrong information posted. But it’s odd that there are no credits for her in the show. She looks familiar, so I was looking for the actress’s name. I’m wondering if it may be someone well known that we haven’t seen in a long time, hence withholding her name. If it’s a big name, it would allude to her being in a bigger role, which seems to be happening now. Like you say, she seemed inconsequential in the beginning. Or maybe she was cast late and didn’t make the cast list in time.

Don’t despair, that character at the end might still end up active. This is TV Land!