Whatever. I'm glad she's not in it tbfh. This is such a try-hard and déjà-vu idea, especially because it has been done just recently and I still don't find that idea to be great; bring all these big names for a video just to make up the fact a song is plain and simple bad just doesn't do it for me.
Madonna is better than that and so is Britney.
She doesn't need to appear just for the sake of it "hey hello, yeah I'm friend with Madonna!". Brit is a longtime Madonna fan and still is, and her appearing in her video or not, has nothing to do with it.
I mean, she already performed with and appear alongside Madge on several occasions, and those moments are far more genuine, unique and special.