I would caution you not to wait too long to have a vet out.
I had a horse who flipped coming out of a trailer the day he arrived. I wasn’t present, and the trainer didn’t tell me about the accident - I found out many months later from a barn worker who witnessed it.
He wasn’t lame, he wasn’t obviously sore. He didn’t buck, he didn’t kick. He jumped 3’ courses, and did perfect lead changes, and generally took care of me. He was just kind of crabby under saddle - switching his tail, pinning his ears periodically, etc. It was blamed on him being annoyed by my leg brushing him with spurs (I’d never used them before but he needed them; though they were the nubbiest, bluntest little spurs you’ve ever seen). After a few months of continuous crabbiness the assistant trainer proposed that he was not being annoyed by the spurs and that he was, in fact, sore.
We had him checked out, and let me tell you this horse was a SAINT to have been packing me around. He was sore everywhere. We didn’t know the extent of the problem (or what caused it, at least at first) so it was a months-long game of whack-a-mole with different sorenesses and subtle lameness. We did hock injections, ulcer treatment, and massage/chiro. We messed around with shoeing and we rehabbed for his SI issues. It felt like an endless cycle where we’d get one part of his body better and find out somewhere else was sore; realizing the part we just fixed had been so bad that it had been masking the other problem. Eventually we had a bone scan done, and he lit up like a Christmas tree. Hid neck, back, shoulders - you name it, it was probably sore. We didn’t have X-rays done, but I wouldn’t be surprised if he had broken his withers.
His jumping career was over, and his future as a light riding horse was questionable. I ended up losing him to colic about a year after the accident, so I can’t say how everything would have turned out in the long run - but I’m sure he would have had a better chance of recovery if he’d been extensively checked out and aggressively treated from the get-go.
She may be ok, but if it were me I’d be inclined to get her withers x-rayed, her SI assessed by a vet and/or trusted massage/chiro person, and maybe have her checked with one of those lameness locators if you have access to one. At the very least I would give her a week or three off riding, in case she’s bruised her topline, and have her get a massage, since falls like that usually result in at least some muscle tension and soreness.
Most people would probably consider this overkill (which is fair!), but believe me, it is completely heartbreaking having a horse go through what my horse did. I hope she was lucky and walks away from this unscathed.