Just like Robert Byrd, as long as they can keep her in office they will,

because she's a reliable 'vote', and the clowns around her really don't want to lose their position, and the Party can use her.
Multiple sources tell Rolling Stone that in recent years Feinstein’s office had an on-call system — unbeknownst to Feinstein herself — to prevent the senator from ever walking around the Capitol on her own. At any given moment there was a staff member ready to jump up and stroll alongside the senator if she left her office, worried about what she’d say to reporters if left unsupervised. The system has been in place for years.

“They will not let her leave by herself, but she doesn’t even know it,” says Jamarcus Purley, a former staffer.