Headache? Really? Not feeling well? Hmm, not sure

I have been watching the kids this past week, well, almost the entire week. I am actually watching the kids for 2 different families during this week, both families rock!!! I love their kids!!! One of the families is the very first people I babysat for :) Anyway, so today I am watching their kids. The kids are rather grown up now, the oldest is 17, and the youngest is 9, which is very different from when I first met them and the youngest was 1 month old :) Anyway, today the youngest one woke up and informed me that she was not feeling well. She said her head and stomach hurt and she felt funny. After her crying for awhile because she did not feel well and wanted to stay home, I gave in, called the school, cancelled my volunteering that I was going to do while the kids are at school, and let her stay home. She seemed to be ok with my course of actions, and I really don't mind keeping her home if she does not feel well, and I can sympathise with her having a bad headache and just wanting to rest.
However, I find it funny that she decided to play piano and do hopscotch...Hmm, seriously? Because when I have a bad headache I just want to lay in bed until it's gone. She has been rather chipper since I told her she is staying home. I am thinking that I have been tricked :) Honestly, I don't really care, I think her mom might care more about her skipping school today, but honestly, I did not want to shove her out the door if she didn't feel well. Anyway, as part of my agreement to her stay home, she needs to take a nap during the day. I think it's a fair play since most kids who don't feel well are up for a nap anyway. She seems ok with it, although I doubt she will fall asleep. She is laying down as I type, but we will see.
Like I said, I enjoy spending time with her, I just found it funny that she wasn't behaving like she was feeling badly. I wonder if 9 year olds don't put it together that if you say you feel sick then you probably shouldn't be jumping up and down on trampoline and do summersaults off the couch, but maybe I am just getting old and don't know what I am talking about :) Just thought her behavior was amusing and I did chuckle a few times at me being so easily swayed to let her stay home :) For those of you who don't know me, I am a pushover....big times....as long as kids behave they can get me to do just about anything for them.