I'm going to point out that a friend's mom's recipe is just the one from the tin
Why do you feel the need to bring this up? Do you think it will help?
Yes, I consider that will help her.
I think that this one is not worth it. If it is something so little like that you should just stay out of their business.
Really? I feel like it's a good thing to do. I want to cheer her up and make her feel better.
Why would pointing out she stole a recipe make her feel better? Please just keep it to yourself and find something real to complain about. You could just compliment her if it tastes great.