In reviewing her career on Ovtur (ever wonderful and reliable), I saw what I had heard decades ago: that Karr stood by while they fiddled with Seesaw, during/after Kazan was fired. CORRECTION: She did NOT play it "between stars"*. Apology. And she then stood by for Lee on B'way, played her vacation, and it looks like closed the show with Gavin.
*Apparently Lee never played the show in Detroit, and I have no evidence that Karr went on for Kazan