You can change milk intake to soy based milk or lactose free. Because the more you give cow's milk, the diarrhoea will not stop. It can take a week or two. Does she recently have it due to her recent vaccine? If yes, then stop and switch milk. Wash but with soap, pat dry and put clean diaper. For her abrasion can apply Densitin Purple (Max) once/twice a day. This helps prevent butt rash and blisters.
Switch to lactose free milk, if still diarrhoea better consult PD. They can prescribe hidrasec, so far very effective for my baby, took once or twice then she’ll stop pooping. While having diarrhoea pls don’t use wet wipes to clean her bum, use cotton ball and water instead, or you can also wash her bum with water. Then apply thick layer of Desitin purple or Sudocrem after every diaper change.