Having a few kids of my own the thing I have noticed the most about gun selection is more on fit and less on caliber (within reason). My oldest is 10, 80lbs soaking wet and a bean pole to boot. My suggestion to you would be invest in a youth stock, or Remington youth rifle. The ADL is relatively inexpensive once you think of the powder and bullets you would burn developing her a load. When a kid uses a standard LOP gun they get stretched out and it opens up a multitude of other issues. In my non so scientific opinion I see more felt recoil simply from bad form due to improper fit. My oldest practices with a .22, hunts with a lightweight Remington youth 7mm-08 or 243. He took his first whitetail at 7 with the 7-08. I’m a big caliber fan, mostly bc all of us want a well placed shot, but it doesn’t always go the way we want it, especially if it’s our first attempt at a particular animal. I also think a 7-08 is a widely undervalued caliber for its bridge between bullets options, terminal ballistics, and felt recoil. Hornady makes some light light rounds for reduced recoil, but off my head you have a huge selection of factory ammo from 120 grain stuff up to 165, ballistic tips, partitions, game kings... the list is long. Another rifle may not be what you want, but for proper fit on length of pull and good form it may be what is best for her. Just food for thought.
Happy hunting!
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