Poof... .it never happened... .
I still suggest that this is a hot button topic and maybe a good idea to wrap your head around an easy approach/rules for yourself for next time she wants to play with that button.
In my last MC sessions we actually were told to just write down hot topic arguments, not discuss, then bring it into session for talk with MC only.
Magically... .
He never hit buttons so much after this as he did not want to discuss why he brought up same stuff again and again in therapy when it appeared it had been resolved!