30 yr friendship

Sounds as though your friend's not well ?

Shame after a 30yr friendship. you didn't say how her last reply sounded but would it be appropriate for you to reply that it sounds like she is having a bad day, is there anything you can do to help or would she rather be left alone for a while? You can always contact her then in a couple of weeks if you haven't heard just to ask if she is ok. If she is again nasty then perhaps withdraw and await contact from her?
Good luck - it hurts when this happens I know

I too would let this pass for the moment.
I have a wonderful friend of almost 50 years standing. about 10 years ago, we both made the decision to leave the area we had lived in for 40 years and return to our home turf - and that sadly put our friendship on a different footing as we are now 4 hours drive away from each other. About a couple of years ago, we had a slightly 'tetchy' visit that upset both of us, but slowly and gradually we rebuilt.

I think my first reaction would be to wonder why she has suddenly become so picky and difficult. There may be something going on in her life that has left her on edge, stressed and upset.

I also feel with a long friendship, like marriage it becomes closer or at times more distant and it is worth riding out the bad times for the return to normality.

I would just let it rest for a while and see what happens and then contact her again yourself in a months time. Act as if this recent exchange had never happened and see what happens.

I would never throw a long friendship away over a couple of months when it goes wrong.