TC - you may find lots of those 70s vintage Marlin 444s around - for some reason people bought them but didn't use them much. Me, I shoot my 444s more than any of my other calibers.
You can probably get that rifle for about #300 or even a bit less. Make him an offer, but jump on it. The rifle will carry the older 1:38 twist 12 groove (microgroove) barrel, but with firelapping she will shoot cast bullets equally as well as jacketed. There are tons of heavier loads out there today for the 444 that make it capable of taking anything on the North American continent.
I would go for it, especially if she carries the Monte Carlo stock. HTH. Mikey.