Hi. My 19 Month Old Was Prescribed Cefdinir For Pink

Hi. My 19 month old was prescribed cefdinir for pink eye, but it does not seem to be helping. Today is day 3 on Cefdinir and it looks worse instead of better. I have prescription drops (Polymyxin B Sulfate and Trimethoprim) left from when she had pink eye last year, and they are not yet expired. With tomorrow being Christmas Eve, I fear her eyes getting worse over holidays. Can these two scripts be taken together? Thank you for any info you can provide.