Sounds also like she was hurt to learn it through the grapevine which could be understood considering you were supposed to be best friends?
I know I will write to my friends as soon as I hit the 12wks mark and the first to know will be the one that are so keen for a baby... I want them to have a bit of time to digest the news as it will probably not be such a happy news for them. IYKWIM :-(
Anyway I agree with PP, her reaction is out of line and unjustified. Especially after she had time to think...
Sorry about your friends reaction and congratulations on your big news!