It wasnt her home. Permission was granted by the homeowners to enter and proceed with negotiations. If youre not the homeowner, you have no say in who gets to come or go. Also it seemed like the homeowners were on the OP's side. Otherwise they could have easily said get lost. Combining that with what Casey supposedly said about "knowing the law due to being in similar situations before" leads me to believe that the homeowners have had to deal with similar situations before.
Question to the OP: how old is casey and were the homeowners her parents? Just kinda curious...