She can get some steroid cream if the rashes last for a while (it makes them go away faster) and if she gets itchy, something like Xyzal, Zyrtec or Benadryl
works well. The steroid cream and Xyzal
are by prescripion...Zyrtec and Benadryl
If she finds she's having a problem with most of the commerical soaps, making her own plant-based, oil soap might be a good option. If she wants more info about that, leave a note on my page and I'll be happy to tell her more.
Lots of luck!!