Today is my first day back at work after my holiday.

I got less than four hours of sleep last night, I was so nervous I spent most of the night tossing and turning.
When I got to the office, I read our group chat from the past two weeks and things looked fairly normal again. But when my coworker arrived this morning, she was still the ice queen. Haven't been able to talk to any other coworkers yet to check if I'm right but it really seems like I am the one causing her attitude. And I know this person is toxic but it still hurts. I literally feel sick right now. Maybe I should make the first move to at least get back to normal, even if we won't get back to how it used to be, but I don't feel capable of breaking this ice wall :/

I wanted to, this morning. I was determined to just act normal and greet her in a friendly way. But then she came in and I immediately got a bad vibe from her and I couldn't do it. (And no, I wasn't imagining it. She barely greeted my other coworkers as well.)