With that many texts, you'd be surprised at how much juice the phone will eat up. When you're talking, the screen is off (usually) and the phone is doing very little in the background (especially on a CDMA network since you can't talk and do data at the same time). It would be interesting to see what the drain on a battery over a 60 min conversation is vs a 60 min constantly back and fourth text convo.
If your daughter has her phone at school, another thing could be draining the battery... searching for signal. When I was in college, that would kill my battery in a few hours on a phone that would normally go 2-3 days between charges. I don't think most schools employ jamming devices, but the buildings are very thick metal and concrete for the most part and the signals just can't get in well.
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