New couple uc claim, wife on pip.

Hi, in need of a little advice, or even a direction to go.
We used to get esa, wife was in the support group. I upped my work hours few yrs back, esa disappeared, she still got pip though (mental health).
I no longer work due to an accident. I've just started a claim for pip and universal credit, my wife already gets pip.
Job centre have asked my wife to come in to do some work commitment thing, her mental health, agoraphobia and anxiety won't let her step foot out of the house at the moment, her mental state is proper suffering.
Does she have to attend the meeting? What happens if she don't? Should I write to warn them she may not attend in the journal?