I think that for the good of the country, these two issues need to be separated, & Judiciary dealt with first. Not retiring as CA’s Senator primarily (but not exclusively! floor votes!) impacts her state.
But tie vote on Judiciary weighs heavily on every person in the country. It’s beyond reckless as a strategy to hang that on the oldest person in the Senate. It’s untenable given all the new health problems she’s had in the last few months. If she died the GOP would shut down Judiciary entirely