I think La Nicks was out of it - and sadly so. I also think LB went because he missed them and, and I know this is not a popular opinion, his career was no where and FM, while far from the popularity of the Tusk era, was still sellling major houses. Also, I think he wanted to see Stevie and was bitterly disappointed.
But, here is a 1990 BTM performance where she is coherent and they have some sweet interaction, esp. her intro that she hoped that maybe someday that he would find it in his heart to spend some time with her - to me, that was heartbreaking and palpable in emotion.