I know charts are lame, and nobody likes them - but how about one just for the medications.
You could try it, let her do it. Take her to the Dollar Store - get construction paper, stickers, markers, glitter glue, whatever, and make a small chart on a piece of paper (let her do it) for every day and medications.
Give her the carrot. What does she like? D used to LOVE CD's, so if he'd do XYZ and/or earn so many stickers or checks or whatever - he'd get a CD. Get her more Tamagachi stuff. Fill a bucket with toys.
At this point, if she HAS to have the medications, you want to do whatever you can do to get them into her. She is still young enough the charts could work for that.
I'd also do the talk like SW said. She has to be able to trust you. I have always told D with every medication if there's something he doesn't like to tell me. And, out of 30 medication trials, he's only ever denied one. He trusts me.
I will tell you, if this was us, I'd definately be doing the Stop The World thing. medication refusal here, it's just not tolerated, they already just know it. You wouldn't be doing ANYTHING if you're not gonna take em. Period. What's she gonna do? Throw a tantrum. She's already doing that....
I hope you find a way, Stella.