She's got a lot of growing to do, looks to have the smaller draft hip and huge powerful shoulders. Looks to have good bone. Cute face and kind eye. For a saddle I recommend the Klimke dressage saddle, amazing saddle and I just bought a perfect used one with all the trimmings on ebay
for $400. Get a wide tree. My gelding also has to have custom saddles except this one because of his huge shoulder and high knee action, anything that doesn't have the proper flare in front sores his back. Here's a pic of him for comparison.