.30-30 is more powerful, but...
I think I would second the advice for a .357 lever action. Either a Win94 or a MArlin 1894 carbine. Me personally, I am not much a fan of porting, but YMMV. I dont like the powder spit I get out of a rifle round and porting in a short barrel.
I suspect if others were "taking care of" her problems, she would be best served by that which makes her feel confident, and a little too much gun would probably not enhance her confidence with the firearm as a tool. I mean, a .50BMG is obviously a more powerful round than a 30-30, but it doesnt make it a BETTER round for her in her situation.
The REAL answer is to have her put a few rounds down range through both a 30-30 and a .357 and see which she is more confident with. I would suggest a 20" barrel as its still a handy size and the extra lenght will tame recoil somewhat.
I definately vote for the lever action. Its not like she is going to be in sustained combat, nor can the simple manual of arms on a lever action be beat, IMHO.
JT
as usual, IMHO, FWIW, YMMV, and all that...