When your LO is sick, what do you do for sleeping?

LO (22 months) has a fever & runny nose today.

She took an hour long nap on me earlier, and is currently on hour 2 of another nap (it's 4:15 pm, here). Usually, she's up at 3:00 from nap.

Should I wake her up, or let her keep sleeping?! I don't want to wreck her sleep tonight, but if she's getting any relief right now, I don't want to wake her. Catch 22?