I saved my friend's life three times at her request and now she doesn't really talk to me
Why doesn't she talk to you?
I think she is too shy to communicate with me after my help
Maybe she is too embarrassed to reach out due to all you've done for her. If you want to talk with her it would be a good idea to initiate the contact.
I can't really get mad at her.
I don't think you should be mad, because she might have a legitimate reason for not communicating with you. You should try to contact her if you want to remain friends.