It sounds like Runner still needs to get used to your family. It can be 6 months or more before some dogs are willing to "play". This doesn't mean you can't try; just don't be disappointed if she isn't into it.

If she is in pain from her hips, she's sure to be reluctant to play. Others here have given you good advice on what to use. It sounds like a raw diet might be a good idea. I personally would be afraid to try that, only because I'm not educated enough to know how to do it right.

Play dates sound like the best solution for now. Maybe classes to give her more exposure to other dogs.