Maybe it was my stubbornness, or maybe it was my skill. 

You may only need to use them in the stubborn areas.Also, if the floor is a large area such as a 2 car garage and or has any cracks, you'll want to put down an isolation membrane first. this will keep the cracks from telegraphing through your tile.

Now as a military member myself I know we can be stubborn and hardheaded.

I am not even sure if I get to the court as I am living out of state and I doubt if I can sue them for their stubbornness in doing stupid things.

I would try goof-off if its really stubborn, if it is stained wood I would look at some wood cleaners/ and possibly sand and refinish portion to match depending on area and quality of unit.Also give TSP a try.

She is very stubborn and really whats something she can call her own.

Okay, maybe, but not that great.So since you asked for help, I'm going to offer my stubborn, ornery little rule, borne of hard personal experience. 

Older people are more stubborn & if they've been living in the property that long, they're probably going to die owning that house.

It is likely the seller is stubbornly sticking to an unrealistic price, but months on the market and possibly weeks between showings might increase their motivation.

Engineers tend to be a bit stubborn.