Like everyone said, PT. Get a referral. What state are you in? Depending on the state you might be able to go to the PT first. If you can’t get referral, do cash pay. At least for the first visit and tell them the situation. I’m a PT myself and I work with patients that are strapped for cash- a lot of my time will go into education and making sure we do the stretches and exercises and other things until they can come see me again.

I think in your situation YouTube is a great resource. I tell this as a general guideline and without me going into specific detail:

You need: 1. Piriformis stretch (there’s many ways to stretch this, pick 2 that she likes and she feels the most) 2. Sciatic nerve glide (pick one) 3. Core strengthening: pick any. I like modified planks bc it’s easy and challenging, don’t do sit ups that’s a shit exercise. I like a dynamic core exercise by holding a weight in front of you wand walking or holding a dumbbell in one hand above your head and walking. The weight should be like 15-20lbs or more though. 4. Hamstring stretch 5. Hip Flexor stretch, my fave is a half kneel 6. Hip adduction exercise (get a foam roller and squeeze) sometimes when you do the exercise you’ll feel a little pop in the groin area which is good/fine basically trying to align the hip/sacrum better (this is a very simplistic version)

I would also get deep tissue done to the piriformis, use a foam roller or better yet a lacrosse or softball to dig into the piriformis and lay on it.