I'm going to laugh at my friend for not knowing how to do a quest in skyrim
Why not just help her do the quest?
I mean I don't want her to die, but I also want her to learn on her own.
Instead of laughing at her, help her instead. Skyrim is one complicated game and very buggy. She will be thankful when you help her beat that quest.
Too late for that. I already told her she sucks and gave her a video guide for the quest. She won't be stuck on it anymore.
I get that you wanted to help her but laughing at her for being stuck is the exact opposite. Instead ask her if she needs help because Skyrim isn't an easy game and even veterans have trouble with it at times.