This sounds very alienating on her part. Have you otherwise had a good relationship, or is the understanding that you're there because you have to be in order to get the letter for surgery? If it's the later, can you find one who's more understanding of your situation? It seems that you're picking up on a coldness or distance from her that could be real or could be projection, but if she's not around, it's hard for you to work that out.

I guess I'm mostly bothered by her saying she'd get back to you for scheduling. If it's the flu, she's not going to have it forever. Sounds to me like she wants the holidays off. I hope I'm wrong, but the vibe is pretty funky.