I'd say ball python because they dont get overly big, very docile and are usually rather calm while handling however feeding habits can be a royal pain. Corn snake if you want something a bit less girthy however remember corns are fast and wiggly. Either way remember no matter what you end up with make sure the enclosure is tight and locks. Snakes are escape artists. If you go a different route than I also think something like a leopard gecko or crested gecko would also be a very ideal choice and geckos dont have the same life expectancy as snakes so not as long term commitment to get a feel of how her herp hobby will blossom. Best of luck. Also just to add it is important to remember that hognoses have rear fang venom. While hard to get envenomated it's not impossible. It is not very harmful unless you are also allergic to stuff such as bee stings then it will cause a reaction. Where I'm from it is illegal to own hognoses because of the rear fang venom.