She's been in the last stages of 'Time to say f*ck it and just go fishing' stage of life for 10 years, she's been on more life support than Johnny Rico after the Klendathu raid for the past couple of years. She could have hung it up in about 2014 to give Obama the appointment, it was her egotistical choice.
I doubt the GOP would try to get through an appointment at this point, personally, not that I'd be troubled if they did. Garland was an exercise in the power of the Senate Majority Leader, no matter what rationalization it's draped in, but as far as 'Precedent' time has shown us it doesn't really mean anything outside the current Congress, the Dems have shown before that given the chance they'll throw it to the wind for an advantage.