I'm sorry, I've read through this post and the others you have put out. Are you sure this horse isn't too much for you at this point in time?
I'm truly not meaning to be mean or rude, just something to ask yourself...
If you feel like you can do this, you truly need to get some books or videos to show you the correct way to do the groundwork. Groundwork HAS TO BE consistentn, not haphazard. The games are fine, but I really think you just have to get yourself in a routine with just the basics for this horse. If you can't even pick up her feet to clean them, I suggest you start as if this horse was barely greenbroke!! You have to also work with desensitizing this horse. She shouldn't be nipping at you period or she should get a quick pop on the nose...even a thump works since their noses are so sensitive. NOT A HARD POP, just enough to get her attention!
I had responded before saying Iwould give you some groundwork tips, but I truly think you need to do some studying and figure out what's going to work best should you decide to go any further with this situation.