She clearly doesn't value your friendship as much as you, and is obviously trying to break all ties with you. Find another friend you can confide in and leave the relationship as it is, you're obviously winding her up more and more with wanting to get your friendship back but she obviously doesn't want it. It sounds to me like she's scared of supporting you and discussing with you your operation, maybe she feels she can't be the supportive friend you need. Hard as it to end friendships, its what you need to do, for now. Maybe in a few weeks/months she will realise how out of order she has been for leaving you at such a critical time or maybe you will come to realise she's not worth getting worked up over. Seems to me like she was a very good friend, but now she's just dumping you, doesn't seem very nice to me...
Good luck with everything xxx