2. 11 yr old fever since 6days. By side.

Hello Doctor, My daughter is 2.11 she had viral gastroenteritis on 28th Jan and lasted for 1 week post which she lost her appetite drastic. While nursing it back she ended up having a mild cold on last Wednesday and woke up to a fever on Thursday 99.5. It started spiking to 103 that night. I gave her Meftal P. Post which have been giving her Crocin DS. It goes and comes back to 99 or 100. As of today, she has also started passing loose stools about 4 times in the day and small quantities that are looking mucus. She has a cold where the mucus is slightly yellowish and cough that irritates her a bit. I gave her Kofarest PD and started Augmentine DDS today. Now when I check, her fever is back with 100.8. I am worried and want to understand is this Viral fever or do I need to subject her to blood tests. I do not want to do it however if I dont have a choice I will. Will augmentine help. Do I need to continue crocin also side by side.