RE: 223 for daughter
IMO it is enough WITH PROPER SHOT PLACEMENT!!!!! 22. centerfires generally leave a smaller margin for error. Nobody likes to make a bad shot, but lets admitt it, they happen to everybody sooner or later. I've seen deer go down within 10 yards from a 22 hornet, but that doesn't happen every day.
i'll say it now and get it out of the way, .243
Also, it sounds like you are being very responsible towards the education/training of your daughter.