Ohhhh what a cutie. Is he a Bullmastiff or OEM, and does he have a docked tail?
That is kinda unusual. They are sooo nice though, I have both Bull and OEM and they pretty much run my life.
.. Hmmmmm sounds like quite a problem. You didnt tell how old she is, that could be of interest. That she is food aggressive, is not a good thing, do you free feed or do you give them once or twice a day?? Even if you can not solve that problem, maybe you could settle for working "around it"
The potty thing, have there been any big changes in your house lately, something that could make her stressed out and wanting to provoke??? Could she be in her teenage months?? They can be real pesky when they go through that stage, forget everything they ever learnt. You say she got worse when you used a crate, did you crate her when you left so she would not go potty inside or when did you use it and how did she get worse???
I know, lots of questions, but the more you tell about her, the easier it will be to guess what may or may not help. When is she going potty inside, when she is alone, when you are there or both?? There are so many things I'd like to know lol..... Its gotta be real frustrating though, hopefully you can get some ideas here, it would be real sad if you had to give her up. I am sure we somehow can brainstorm and figure out how to get your girl back in line.