That sucks, it sounds like a really nasty virus..! What is she even doing upstairs with that?! At least she has good intentions with lysol but it might not be enough. Try to wipe things she touched with a diluted bleach solution (careful, only hard surfaces and avoid paint cause it'll bleach it..) and leave it wet for a few minutes before wiping it with a paper towel. That'll kill everything. And wash your hands! That's the best way to beat this virus!