My battery life is so-so. What I mean is that some days, like when I first upgraded to JB, battery life was amazing. After the update my phone was around 50% battery with not a lot of screen time. After playing around for a few hours, I had 6% left and 3.5 hours of on screen time. The following day I noticed my battery draining a little fast when not being used, but still lasted the day and I had about 60% with a couple hours on screen time when I called it a night. Yesterday was ok, listened to Pandora a lot so battery drain was fast. Today, I'm having about normal. Was doing a lot of web browsing over 4G this morning so that sucked some battery. Right now I'm sitting at 83%, 5 hours and 11 mins since being off the charger, with 37 mins on screen time, this while leaving 4G on. I rarely use wifi since I'm still on unlimited, so I'm going to use it.
I would download GSam Battery Monitor to see what is exactly eating up the battery. A little restart wouldn't hurt things, no, not a factory reset. Turn the phone off, then turn it back on. Let things settle down a bit. A couple charging cycles would not hurt either. Drain the battery down to 1%, turn off phone, charge it, turn phone back on, rinse and repeat a couple times. If all else fails, do an FDR.
I should also point out that everyday can be different. Your daughters phone can be getting horrible battery life today, then tomorrow it can be phenomenal, then the next day it can be horrible again.