Weird Al made it her choice, by asking.
Yup, and was decent enough to honor that... but really he had every right to do what he wanted with his parody. The fact still remains that he came to her with an idea, provided lyrics for and told her proceeds would go towards charity, and then she made him work and record the full song before saying no. She had the lyrics, so knew exactly what the song would say, yet she made him go through the process of recording before telling him to fuck off without reason. She could have at least stated which parts she didn't like so he could change the lyrics or something. Instead she put her own selfish bullshit ahead of a potentially large chunk of change to a charity. I don't care how terrible the song was, it would have at least sold a bit because it was connected to both Al and Gaga.
I've never liked her music or image, but now I have a reason to not like the person either.