[To Pilouette it sounds to her like a run-of-the-mill cold. She takes a few moments to try and think of whatever useful information she knows before replying.]

Well, they say that people need a lot of rest to recover from being sick, so sleeping a lot is probably alright if she's sick. Since she's cold, warm foods are probably best. Soup, warm tea...stuff like that. Lots of fluids, too. For the aches, simple painkillers will probably work, like aspirin or something. Does she have a fever or anything?

[However, she's not exactly a medical professional and doesn't feel completely confident in what she's saying. So just in case...]

Whatever this sickness is, keep an eye on her. If it gets worse, she might need to visit the clinic. The doctor there knows a lot more than I do about sicknesses and stuff.