To be accurate, I was a vassal to the HRE, she was independent.
I fought my way out of this one in the dumbest way possible.
Given that I was Holland, I had loads of money (I built exclusively harbors and trade stuff, coupled by a few castle villages and rest of the +tax buildings), I was able to hire loads of mercs. The king of England was excommunicated, so I went to war with him on the grounds of his religious transgressions, used my troops to bash his troops in my wife's lands, until he asked (I guess that's what happened) for piece with my wife.
The exc war ended as he died, but by then my wife had ~70% of war score against him given that she held the land they were fighting for unoccupied by him for a hefty amount of time...
All was well in this case, though I still think it should be tweaked somehow...