I don't think you should do anything to be honest.

I don't believe you're in the right frame of mind right now to be making rash decisions on ending friendships.

She has a life and has a lot on the go at the moment.

So perhaps she doesn't text you as often as you would like; but she still is making an effort.

She was there for her when you really needed her to be last year.

You've just had 5 weeks off work. Clearly you are unwell. Please don't do anything just yet.