Advice?

Three-year-old Geneva has the flu. She needs a good nap. She's decided it's not in the plan today. Here's our 2pm conversation; she is laying in bed and I'm knelt beside the bed. 

Me: Geneva, you need to have a nap. Especially today because you're a little bit sick.

Geneva: But I'm not sleepy.

Me: If you lay still and close your eyes and your mouth then the medicine will work better.

Geneva: That's not true.

Me: Yes it is.

Geneva: Mom, that is not true.

Me: Yes, honey... it's true. Medicine works better if you have rest too. You can't fall asleep if your singing and playing in your bed. Please close your eyes and your mouth and take a nap.

Geneva: But I'm having a problem with my ankles.

Me: Really? Your ankles are giving you some trouble?

Geneva: Yes. My ankles are rubbing and it's making me feel the throw-ups are coming.

Me: I see. Well, be still and quiet and you might feel better.

Geneva: What are you going to do about my ankles?

Me: I'm not sure. Let's talk about it after your nap.

So, what do I tell her now???