Was it Mrs GGB who feels like she has to pee when she's approaching O? It sounds like she's afraid of letting go or losing control, which would make having an O difficult or impossible.
Is she also emotionally avoidant? It's hard to keep everyone straight here. I'd suggest talking to her about her panicky feelings, but I suppose she wouldn't want to talk about it.
Is she worried about getting pg again? That would certainly make it difficult for her to let go and get into it.
You said she stops you when it starts getting good. Is she getting manual stimulation during this time, or IC?
Sorry if I'm asking the same old questions that have been asked/answered before.