Umm hello.. give her a good whack on her hiney and send her forward!
You asked for her to move on, she refused.. I would really make her regret that decision.
Or if you don't like that approach, ask her to yield her shoulder to you and do a few spins on her hind end whilst on lead.
Or back up 10 yards.
Or do a mix of all three!
Had a mare do this to me.. a 4 year old Primadonna who decided to test me. I didn't stand for it. You let a horse push you around and make decisions, it's going to turn ugly very fast.
"Strength is the ability to use a muscle without tension"