Thanks for all the advice last night. Rose is doing better today. We did take her to the ER because when M picked her up at daycare last night her fever had risen to 104.7, and I was worried it could keep rising. We had a pretty decent ER experience, fortunately; they got us in and out as quickly as possible, about an hour and a half in total. The advice was just what you all were saying: Tylenol/ibuprofen, keep her hydrated and keep an eye on her. I was very relieved when I got to the ER last night to see that she was acting basically normal; a little fussy & clingy, but otherwise her usual inquisitive self, which is a good sign.
She slept well last night and after taking another dose of Tylenol this morning, her temp was down to 99.1. I'm sure it will fluctuate a bit, but am very relieved that it's responding to medication.