The only thing that you can do is to offer to ID the snake, and/or offer care information. Otherwise, no, there's nothing you can do.
Everyone started off not knowing about snake care. Most get the snake, then learn how to properly care for it. Some learn all about the snake, then set things up, then get the snake. A few get the snake, don't bother to learn about the care and either get rid of the snake or it dies.
The least I would worry about is over- or under-feeding. A secure enclosure with properly regulated heat would be uppermost in my mind. If you are really concerned, you could ask your friend to put you in contact with her friend and get to know her better. A hint: Starting out with 'Do you even know anything about this snake?' will end with you being pointed at the door figuratively speaking. Instead, work your way to suggestions. Be enthused about the new pet, and ask lots of questions. Suggest a type of cage you've seen(pick the cheapest GOOD option!) with enthusiasm. Say things like "What kind of thermostat would you get?" instead of "You know, you need a thermostat" to both imply that she DOES know already and to encourage her to learn more to impress you.
It's 100 times better to encourage someone to BECOME a good keeper, than to try to make someone not keep pets. If they want the shiny new pet, they're going to get it. So make her into a great keeper(and then you can enjoy her pets, in addition to your own and even compare notes as they grow).
Good luck.
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