LarryW's post makes a lot of sense, especially since you've got a clean slate to work with. I'm x-dominant. I have found that it can be, to some extent (1) trained and (2) tricked. But reading Larry's post I am thinking, "if this were my daughter, why?" I guess I'd try it both ways and see whether using the "wrong" hands with the "correct" eye is better than the other way 'round. Again, Larry's post suggests you follow the eye...for me, I think I'm better off the way I've done it shooting for 40+ years.
Tricks you can use involve anything that tends to emphasize the RH eye. I find that even a slight squint (not even close to closing the eye) will always tip the brain over to the RH eye. Using red dot sights shuts the LH eye down quite well. Less so with scopes, at least for me. I will say I find skeet hard, but even that is do-able.
Experiement, be patient and encouraging, and don't get frustrated. Make it a project to have fun over and with together and it'll work out. She has lots of company.