I'm thinking 14" or less, a SSD, and accidental damage protection. SSD stands for Solid State Drive -- mass storage for files and programs with no internal moving parts, that therefore isn't susceptible to mechanical failure. This way there's no danger of losing all her files or trashing her Windows installation if she drops her laptop a few inches. If she drops it from a more significant height, or spills something on it, that's what the accidental damage protection is for. Your only other option for someone as accident prone as you describe your daughter is one of the truly rugged, military grade machines, meant to be used in desert sandstorms and literally bulletproof. Unfortunately, those are heavy, expensive, and terminally uncool.
The only manufacturers I know that offer accidental damage protection are Dell and HP. Dell doesn't seem to offer real SSDs on their cheaper machines, so after adding the warranty and a decent amount of RAM you're already at ~$1400.
The best and easiest option I see for you is the
HP dm1z. Add the 4 year (!) accidental damage protection plan, upgrade the processor the the E2-1800, change the hard drive to a 128GB SSD, MS Office Home and Student, and I'm seeing $1003. You may also want to consider a RAM upgrade to 6 or 8GB and LoJack. Note that as this is an 11.6" netbook, it does NOT come with an optical drive for listening to CDs/watching DVDs. You'll need an external optical drive for that (~$30).
If you're willing to do the RAM upgrade yourself, you could get 8GB for ~$40, instead of paying HP $100 to do it for you. And for the $200 they charge you for a 128GB SSD upgrade, you could buy a drive with twice the capacity and install it yourself -- but that would void the warranty. And if you were willing and capable of doing
that, there are better laptops that you could get. You could get a laptop that is much faster for ~$600, do your own upgrades, and have a machine better in every way for less money -- but without the godly warranty. That's what you're really buying here. There aren't many options for clumsy people. No one is chasing the "people who break things and want new ones for free" market.
I have last year's dm1, and it has served me well. It's light and solid enough that I pick it up and carry it around by the lid without worrying that it's going to snap or the screen will crack. The keyboard is nearly full size and comfortable to use, and the battery lasts about 6 hours. The processor is very weak, but it's still good enough for HD YouTube and Skype and some light gaming.
If you want something light, durable, with good warranty protection including accidental damage, fast
enough, and you want all of the upgrades done before the machine gets to you, this is the machine for you. Just be aware that on a processor this slow, any bloatware is too much. You're going to have to do a decrapify or clean install the moment you get it.