My 9 week old is really resistant to taking her antibiotics, she's so smart that she realizes when I'm hiding antibiotics in her formula, the syringe in the nipple and thwarts any attempt to give her them.

Last night she vomited after administering them, and I'm frankly a bit worried. There has to be a better way. What is a best practice to give my squirrel her antibiotics without hurting her?