I don't think I would shoot anything I want to find with sub sonic. I have seen to many get away from other hunters. I don't shoot sub sonic in my 338 Lapua suppressed and it kicks about like a 243. Suppressors are fun but she may not like the added weight on the end of the gun.
My daughter uses a 30/06 and I sighted it in with Hornady low recoil. She loves it. Kicks like a 243. She got an 11 point with it this year.
I once drank muddy water out of a hoof print and was dang glad to get it.