Girls, why is she ignoring me out of the blue?

Anonymous
There's this girl at college I've known for 2 years. We get along great from the moment we met. We see each other 3 times a week and text quite regularly for hours.
But now she's completely ignoring me for no aparent reason! She won't even say hi to me unless she absolutely has to (like if I'm with some mutual friends and she comes, so she has to say hi to everyone) and that's it.
What hurts me the most is that she is (or seems) perfectly fine when she's with anyone else!
When I texted her to see if there was something going on or if I had done something she said that she was just stressed (she is having a lot of exams, that is true), but when she's with other people she's smiling and talking like she's just fine.

What's with this? What should I do?
Girls, why is she ignoring me out of the blue?
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