C.O.
relationships are a two way street...it's not her job or place to call you all the time - it's great that you picked up the phone and called her..
the problem with FB, Myspace or even here is that you cannot HEAR the voice or the inflection so what YOU interpret as snappy - might not have been...
Yes, people need to think before they talk - that's true...however, sometimes when we are comfortable with someone - we don't think before we talk.
If she is rude to you again, then I would talk to her about it...if not - let it go...why hold on to anger? Especially if someone has said they are in the dumps lately....