First, she lost the ability to jump into and out of bed. I picked her up and put her on the floor as needed. Then, she lost the ability to use her doggy door. I let her in and out at night. Finally, she started having accidents in the bed.
Now I put her in a doggy bed outside my door, and I sleep with a plush boston terrier toy. It sucks, but I am still so happy that she's still in my life.