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That's tricky. How much every day does she use her phone? With the regular battery, you'll get about 3 hours of screen on time (a bit more with a custom kernel probably). If that's enough for her, then I would say giving her your nexus. However, at this point I would suggest for to wait, either until the new quad core Krait processors, or the dual core Exynos 5 are out. Essentially, the next round of phones coming out this fall (including the new nexus(es)), will be fantastic, and if you can you should wait.
If you can't, the Galaxy S3 is a fantastic phone if you like touchwiz or are ok with custom roms.