"Any bow, good bow, good arrow heap much work."
Start light as noted above, however make sure you get arrows that fly perfectly from the bow. You want her to see that same smooth flight that we all like to see. You may want to look at some 1816 aluminums to start here with. My youngest daughter uses them out of her bow and they fly like little darts. When she's ready to step up, my older daughter uses Easton Axis 600 size carbon arrows. These also fly well in low weight bows. Leave them long and put a little weight up front.
Also, make sure you invest in an armguard for her (a good coverage one) BEFORE you start. I don't use an armguard personally, but women have a different structure in their arm and tend to have the elbow bend in and that can produce a nasty zinger. Best to head that off before you even start.
Good luck