Does your horse know the basic vocal commands of walk, trot, canter, whoa ? If not.. teach them to her. It makes lunging a lot easier and a lot less stressful.
We have a horse at my work who just canters and canters and canters, bucking and playing and just ripping around the arena. She won't stop, unless you get a whip out, and unless you pretend the line is like your rein.. and do half halts, playing with her mouth (if she has a bit in)
If not.. second best option is to lunge in a rope halter since the knots act as pressure points.. generally better cues that asking in a nylon halter where it feels as though you're just pulling on their face.
Sometimes your horse just has a LOT of energy and would do better running around, as long as they don't get wild (panicky and scared and not paying attention to their feet.)
Also, if it's your first time lunging her, try working in a round pen. Not too small so you have your space.. and just let her run around on her own for a minute, sometimes that helps, and when she's settled, she'll prob try to grab a bite of grass and then you'll know she's ready to pay attention to you.