She'll shoot BH209 nicely.
One bullet off the counter i'd recommend are the 240gr hornady XTP's. I believe these come with the mmp-24 sabot. I bought a box a few weeks ago for $13 and my Optima would put 2 out of 3 shots touching at 100 yards.
Give that gun a good 10 minutes to cool down, maybe even more if you live in a hot area.
I'd be more than happy to take a look at the rifle for you if you wont be hunting with it this year. I can work up some loads for you with BH209 and figure out what she likes.