S.T.
Make it positive, allow her to have some control and be honest. Acknowledge that it tastes gross - but there are ways to help make it less gross. Show her a medicine dropper that will help her get it to the back of her mouth. Allow her to put the dropped in her mouth towards the back. Let her choose which kind of treat she can have some when she takes her medicine without a struggle - m&m's or hershey kisses? Make a sticker chart - every time she takes her meds without a struggle she gets a sticker. After she fills up a row of boxes (a weeks) with stickers she gets a rewarded - a trip to the dollar store, special desert, trip to a favorie playground, party with best friend (chips & a cupcake) etc. Work with her to creat the rewards, to make the chart (a small calendar works).
Always reward the postivie behvior and ignore the negative.
Good luck mama!