You've got this OP, you can do it. It's possible, and I promise you won't hurt her. I can do big pekin drakes that do NOT like to be handled on my own, so I promise you, you can get the meds into her 
Do what 
@casportpony recommended.
This is how I do it:
Wrap her in a towel to restrain her body, then tuck the 'duck burrito' between your arm and your body and pin her there. Using the arm you have pinning her, extend her neck and slide a finger into her beak to hold it open. Then with your other hand, administer the medication. Slide the syringe down the right side (her right) of her mouth, like as in this picture: