I think she wants a collaboration too. I hope Gaga isn't too bitter to do it. It would be amazing for them both, and that could be how Madonna does the Grammys, since she needs to duet with a nominee; Gaga is nominated after all. She can do one performance with Tony and one with Madonna.
I'm getting ahead of myself though

I just think it would be an awesome way to:
a) Put the stan wars to bed.
b) Launch Rebel Heart's era with a positive message
c) Give LFL a good buzz.