I mean, yeah she's in a rough patch atm, but if she decides to do this she could perform her biggest hits and maybe even a new single. And then after that go out into outer space and perform.
I would be rooting for her first performance with Bey and she'd have a really good new era.
No. Gaga's performing skills are highly overrated on here. And the GP would annihilate her if she used the performance as some platform for anti-bullying/gay rights like she probably would/does at her concerts. She could never pull it off like Beyonce and Bruno did.