Hi, thanks for using healthcare magic
It is possible that she has hand foot and mouth disease. This is a viral illness that most commonly occurs in children, it results in lesions (water bump like lesions) ocurring on the hands, feet or mouth. They tend to itch.
Treatment is usually symptomatic- treat the itching and use a numbing agent to reduce the discomfort that can occur if they are lesions in the mouth.
It is potentially contagious.
It may be best to take her to the doctor to have her examined to determine whether this is the cause or if there is another source of the rash
Hope this helps