Perhaps the bankrupt husband wanted his share of her wealth?
Or maybe the rent on her apartment was bleeding him dry.
My theory is this is why RR and Mueller are doing things like issuing indictments on the eve of Trump's meeting with Putin. They have to make overt moves that continue the facade. There may be other things behind the scenes… but they have to keep Schiff and others think they have a chance of winning to keep the sting alive.