We made her leave the spot she had picked to die, which was under the bed in the extra bedroom, and put her in her bed in the bathtub this morning. That's where she has had her bed for a couple of years now. No one uses that bathroom unless we have company, and she has lots of peace and quiet away from the dogs.
So I keep going in there every couple of hours and checking to see if she's still breathing. Barnaby calls and asks about her, and I'll go check again. If she stirs or lifts her head, I'll scratch her under her chin and behind the ears for a few minutes. This could go on into tomorrow, but I don't think much longer than that.
It's horrible just sitting around and wandering around the house waiting for her to go, but there's nothing else to be done about it.