When I had my seton in, it stopped the cycle of abscessing/bursting. Occasionally would get discharge that felt weird coming out, but wasn't painful after the seton.
Even with it in, I always had mucus discharge.
It's out now, and we are trying a biologic to see if it'll close on it. The Medrol taper helped the most, it felt absolutely normal, so I had my seton removed, and had two wonderful weeks. Now, I'm on the fence and it's vacillating daily. Might have a few good days, then a not so great one. Nothing like how it first presented, thankfully, but not like those 2 glorious weeks!
Have her soak in a Sitz bath, very warm to nearly hot, with some Epsom salts, or a hot bath. Even a very warm washcloth held to the site can encourage drainage, and can be soothing. I love my Sitz bath and use it often. The dermatologist told me to add a tbsp or so of bleach to it, too, to discourage bacteria, or 1/4-1/2 cup in an occasional bath to do the same thing (not every one).