There really isn't a DH bike designed for someone 5' tall. with long travel suspension, is just isn't feasible.
however, your daughter is 5' and i'm guessing about 100lbs. (yes?) so she doesn't need 7+ inches of travel and the burly overbuilt frames are only going to weigh her down. i would suggest a good all mountain rig (giant reign comes in XS) with a 6" all mountain fork, marzocchi all mountain 1 for example, as a starting point. add a 24" rear wheel to lower the BB and slacken the HA to more DH standards. avoid the 24" front, they fall into pot holes and just plain suck to ride. have a pro tune the suspension to give her proper sag and make the bike run DH style. a super short, 0-50mm, stem and a flat XC bar will make the bike handle better on the steeps and again improve the fit.
build the bike with a full XC groupo. she will NEVER break any of it and a light bike will be much easier to handle
she will have a 6X6 bike THAT FITS and will be more than enough bike for her
if you do this and she still doesn't like it, let me know, my wife is the same size and would kill for that rig.