Lala, I would try and 'borrow' the fenced yard first. Take a bunch of her favorite treats to entice her, and make sure she knows you have them. Is the yard completely fenced off or does it have one side open? If you take her deep enough in you should be ok either way.
If you do let her off and she isn't responding, walk away. Turn around and just start walking. It sounds like you're the boss and her loving mummy, and she definitely won't want to be left behind.
Oh, I don't do running either lol. Let us know what you decide to do.