Take her to a good archery shop and get her measured, fitted and set up properly. Your daughter is worth the investment. If you were an old pro at archery hunting that's one thing, then you could easily do it yourself. But without archery knowledge you're better off to entrust her initiation and equipment to a seasoned pro. If they have a range he can also help get her started with proper shooting form. There are a hundred ways to mess up on equipment selection and set-up, but the experienced guy will be sure you avoid those.

The other word of advice is that when you take your daughter afield to bowhunt deer or other game, be absolutely certain that those hunts are 100% ABOUT HER. You'll only get one chance to have her become captivated by archery hunting. The entire focus should be on making her experience the best that it can be. So give her the benefit of 100% of your full attention and time. Just my opinion and good luck to you both.