Project Pony Pepper

Since I haven't been riding much lately, I've been getting home from work very early and subsequently being a lazy bum. Luckily, I live on a farm in a loft apartment above the stables owned by the Persing family (their daughter Ashley is my eventing buddy). One of the boarders has 2 horses, a big appendix and a little grey hony (borderline pony/horse) mare named Pepper. She's young, about 4 I think, overweight, and kind of adorable. Her mom is currently out of commission with an injury so I volunteered to do some work with her. Wellllll, Pepper is tough. For starters, she doesn't cross tie. She doesn't single tie very well either. We'll just say she doesn't tie. At all. There are broken clips to prove it. Her answer for everything that makes her nervous while tied is to fly backwards and either break things or slip out of her halter. Fun.

I've worked her 3 times this week on the lunge line with waaaayyy long side reins. Her mom doesn't actually have any tack that fits her since the mare really belongs to her sister. (long story) Good thing my pony has plenty of extras. Hopefully I can remember to bring a bridle and his pony side reins home one of these days.

So basically our lunge lessons go something like this:
-enter the ring, start walking Pepper in a circle and slowly let out the line
-Pepper realizes she's on a lunge line and takes off at a ridiculous trot then canters around like a maniac
-I spend the next 20 minutes just trying to get her to WALK in a circle. The main problem? Every time I put any pressure on the line, even if it's just to keep her circle somewhat round, she halts and faces in. When I ask her to move forward she backs up and tries to change direction. If I try to block her with the whip, literally just holding it out to keep her from changing direction, she bolts.
-after a couple half decent walk circles we move on to the trot. Same thing. Tries to break into the canter constantly, to the point where she looks lame behind from half cantering with her hind legs only. Pressure on the lunge to keep her steady? Halts and faces in. Ughhhh.

I can tell already, this is going to be a looonnnngggg process. Any tips would be greatly appreciated!

P.S. all of her lunge work so far has been done with the side reins attached but with no tension in them. I worry that when shorten them so there is even the smallest amount of pressure, she's only going to go backwards and possibly try to flip herself over. Not something I want to happen.