Sidestepper, please don't leave/let another drive you off. I agree that the ignore feature would be very beneficial in this case... it's there for a reason (so those that touch your buttons can't).
This is her baggage... her problem... so, you should and have the right to not let it become your baggage/problem. I can relate to how difficult that advice can be to follow, as I for one have been guilty of letting others throw their issues down my throat to the point that I'm worrying and carrying their burden as well as mine

not healthy... but the great thing about the internet is that it's internet space rather than them getting physically in your face... win win
__________________
Independent Mental Health Advocate (IMHA): UK