I've never owned a 7mm-08, but based on your situation I would not change it up at this point. If she understands the limits of the cartridge, she can harvest any game she wants. Sharing reloaded rounds will be a much simpler process. I'm a Browning fan myself, but there are so many options out there that will serve her well. When you start moving up in chambering she will obviously start feeling more recoil. My daughter really enjoys shooting my 308 Win. She shot a braked 7RM one time and just said it was not for her.