Is she just craven for attention or she is in such demand and feel obligated to satisfy old and new fans. Heck even the mighty 76 year old Sir Elton John just hung up his last costume and vow never to grace a public stage again, and he's got way more hits and fans. It's just who she is, like so many others who performed until death made them quit. It's just remarkable that she has the energy to do all the flailing and antics as if she's back in the 1970s.
Gotta love her.