P.W.
call the doctors office and speak to the nurse. There is always the chance that amoxicillin is not working for her this time. The nurse can give you guidelines of how long to wait before coming back in or possibly changing antibiotics. Considering tomorrow is friday I'd definitely make the call in the morning.
You might consider getting your child on a probiotic at least while she is on antibiotic. It will help keep the flora in her stomach healthy and the meds are less likely to upset her little system. Plus, might actually help with the eczema. If she likes Yogurt get her to eat some every day right now.