i so agree with Foobar about writing out exactly how you are feeling and going back and re reading and evaluating again how you are feeling. Great idea.
I personally am a big believer in evaluating how I feel about something and then saying something to that person you consider to be a friend.
If the friendship is important to you, maybe call her and tell her that you want to work it out and propose that she write out how she is feeling as well. Tell her to think about it for a few days and then get back to you...that you want to clear it up with full clarity of thought put into it.
I have been a professional caregiver for many years. When I was a lot younger I was a live in Nanny for two families. There is nothing worse than miscommunication between caregiver and Parent. I would work it out somehow. Give her a chance to be clear on her feelings again without the anger and you do the same.
I also agree however that since you left her all the numbers where you could be reached, she should have tried some of those if there really was a problem that caused her to feel this way. I have always made it a policy of mine to be clear and concise about the things that upset me. A lot of the times, being upset and feeling angry comes from a lack of true communication and an unwillingness to work it out.
Good luck !!!