I don't know that I'd want her to do it at this point considering all of her troubles with live singing lately, but if she had her stage presence and voice together...
1. "Fantasy" (ODB intro via video because it shouts out everyone and builds hype; album version of "Fantasy" after that)
2. "Always Be My Baby"/"We Belong Together" mash-up (crowd sing along)
3. "Make It Happen" (band intro a la Divas Live to provide time for costume change; maybe a famous drummer as guest)
4. "Vision of Love"
I think if a guest is necessary one could easily fit in on "Make It Happen." It could even possibly be combined with another song.