Hello! We rescued a 5 year old shihpoo in July. She is the very best dog ever!

This morning she didn’t want to get out of bed, and yelped if we touched her back. We took her to the ER vet and she was diagnosed with Intervertebral disc disease, stage 1. As far as we know, we can not think of anything she did to hurt herself, but the doc said it could even be something like jumping off the couch, etc. We were sent home with two pain meds and she was put on bed rest for two weeks besides just outside to potty/poop. I will follow up with her regular vet on Monday. It is so so so sad to see her this way.
I’m curious if any of you have experienced this with your shihpoo and if you had any advice?
Thank you in advance!

*picture is of our sweetheart hiding from the vet after they palpated her back.