Constant fever at 101. 7. I'm worried.

Hello, my daughter is 4.8 yrs old, weight 19.6 kgs. She has had fever from last evening. Goes upto 102. With p250 6 ml it reduces abd then comes back up after 2 hrs and I can't give her another dose so I wait it out while it touches 101.7 again. Today I gave her a dose at 5am and her gene continued to 102.i gave her the next dose at 1030 am. It's come down to 101.5 after 2 hrs but not going down beyond that. Doctor advised to wait for 2 days before blood tests and give meftalp after 2 hrs of p250 if it doesnt go down. Can meftalp be given every 6 hrs for a couple of days. There are no other symptoms except she's a Lil gassy and pooped hard. Please advise if this could be dengue or something or I can wait a couple of days. I'm worried. Thank you.