Put a 1ft leash on her in the house, and either just let her get used to it in the house. Or play happy games with her. Ignore the leash, lots of praise and happy voice for other thing she does correctly. Don't put any pressure on the leash while you're doing this. If she does well, make the leash a little bit longer, and repeat the process. Then start touching the leash. Touch the leash (If she stay happy), release the leash and praise and treats.
If she starts to freeze when you touched the leash. Just do a quick touch on it, don't say anything to her, and go about your business. Whatever you do don't throw a pity party for her.
I know this doesn't help you outside, but you have to start somewhere.
Not all those who wander are lost.
Life is just a leap of faith.
Spread your arms and hold your breath and always trust your cape.
Two things define you. Your patience when you have nothing, and your attitude when you have everything.