Why does this Particular student look away and ignore when she sees me?

I work with students with developmental disabilities and I work in a first grade/second grade classroom. It wasn’t like that when she first started. We first heard her in the classroom. She was only with us for a month but since she was more advanced, we moved her up to a different class. Now it’s like when she sees us especially me, she turned her head away and doesn’t say hi to us much. It’s like, “They’re not my teachers anymore so I don’t have to talk to them.” She didn’t really say that.

Before I go further, she’s autistic so don’t judge her too harshly. She’s seven. Anyways, she’ll say hi to some of the other teachers but when she sees me, she ignores me and turns her head away. I know as a staff I shouldn’t care of a student dislikes me but it does hurt a bit. My aunt said that not every student will like me and I need to accept that and have thick skin. Plus no offense to me and I’m very tall so I’m probably intimidating to her. I was told my one of my former teachers that’s great I want to work with kids and they will I’ve me. The my aunt said, “Well they were only saying that to be nice. They should have told you that not every student will like me or love me. Get used to it. This little girl doesn’t have to like you but she has to respect you.” Come on! Every student likes me! My two coworkers are petite (4’10 and 5’1). The other one is average height at 5’4. I’m 6’0”, plus size, 240lbs and I’m MASSIVE around them. Most women are like 5’9 and under.

When I kindly say good morning she ignored me, but her teacher said to look at me and say hi. She gave an annoyed look and said, “Hi” very disappointingly. Ouch that hurts.

Why does this Particular student look away and ignore when she sees me?
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