I agree with everyone saying they should be focusing on potty training right now. Check out this vlog from about a year and a half ago, Asa talks about how Abbie used the restroom on her own for the first time. If she could do that a year and a half ago, why is she still consistently wearing pull-ups? I understand having her wear them in the pool (because cleaning up an accident in the pool gets complicated, as someone on here previously mentioned) or at night, just in case, but all the time? I also understand some regression happening is natural in learning any skill, but using the restroom is something that would be practiced multiple times a day every day.
I've also read that the sensory differences between a pull-up and cloth underwear can make potty training more confusing for autistic people. Having her wear a pull-up constantly could be detrimental to her being potty trained because her brain may connect pull-ups as being ok to go potty in.