My name is Nakoma!

We adopted this girl in early November from the local shelter. They really did not have any information about her other than she had just been returned by her previous adopters. The previous adopters were an elderly couple and they pad trained her, but she was too much for them.
I have a male rescue from the same shelter and he loves everyone. They seemed to hit it off for the most part. Now however, she is displaying food aggression and toy aggression towards him, none towards humans.
I have teenage boys and she loves to cuddle with them!
She is a really sweet girl that needs to be in a home where she is the only pup. She is not aggressive toward cats, but she will follow and chase them if given the chance.
She is crate trained and knows a few basic commands.
Her shots are up to date and she is on Nexgard Plus for monthly heartworm and flea prevention.
I want to see her go to a good home, so vet and personal references may be requested.