Hand foot and mouth and strep at the same time?

It's Possible: While it's possible to have hand-foot-and-mouth syndrome along with strep throat, hand-foot-and-mouth also causes sores in the mouth, and if you are a carrier for group a strep, a strep test could come back positive despite this not being the pathogen (cause). Fluids, rest, Ibuprofen are very beneficial. See her doctor in 5-7 days if not significantly improving.