When I Picked Up My 12 Year Old Daughter From

When I picked up my 12 year old daughter from school today, her fingers and half her hands were purple, almost like she was cold. She said in PE she got cold but was not shaking or anything then she went to shower and from hip to above knees she was VERY purple.? Should I be concerned, I have her take LONG hot shower helped hands and arms, and little of her hamstrings, but her backside from hips down her buttocks and quads are still purple