The rashes appear to be allergic in nature but I can’t be sure from a picture. You haven’t mentioned how long she’s had them or if she has similar rashes anywhere else. Have you used anything new for her like detergent, soap etc? Any food allergies? You may try calamine lotion on the rash, try and figure out what it is she is allergic to and remove that. If none of these work then please visit a pediatrician or dermatologist for further evaluation.