I hear there are currently two variants of Remington 870 shotguns, one is suppose to be better than the other. Determine which is the "good" 870 and get one of those. I like the 870 with its steel receiver. I have an older Remington 870 20 gauge Magnum and it's great. It's a hunting shotgun and not set up for home defense. The 20 gauge would be perfectly fine for her.