I have a 4 y/o who dislikes potions so she won't take her medicine.
She was sick... the doctor healed her, but her health bar isn't even half full.
What else can i do for her?
And yes, I have been very persistant with her but she refuses to drink that health potion!

Try force-feeding her (takes MANY tries). Other than that, I'd just let her get on with her life, eventually she'll recover.

You may put her to the food bin and make her eating.

I had two villagers like that in my first magic game. I fretted over them for days but eventually came to realize that over all they were the healthiest (and luckiest) people on the whole island. I simply made them eat (and drink water) on a very constant basis and they both lived well into their seventies. Barring an unfortunate event your potion-hating 4 yr. old should live a long and fruitful life. Hopefully you have level 3 medicine to give her an additional edge.

She will hopefully sort herself out in a couple of virtual years - but if she gets worse over time, make her eat a lot, try over and over and over again to get her to drink the health potion and she will need to be healed from time to time again.

Good luck!