I think thats because she was supposed to be in it but couldnt make it and Tarantino still thanked her. Thats pretty awesome id say. An the movie was brilliant
So, because he wanted her to be in it and she wasn't able to, he thanked her? Ok.
Gaga probably tried really hard to fit it into her schedule, thus thanked her for considering it.
The story was about when Gaga and Tarantino were in Cannes, along with Brad Pitt and Angelina Jolie.