Nit, I am so sorry, but at least her suffering is over and You can be comforted by that.
Hoosier had to have her old dog put to sleep the day before you lost yours.
I am glad you are staying awhile longer with your parents but know it will be hard for you to go home without her.
Have yo let your x know or maybe you have no contact details.
A year or so after my x left I lost my 20yr old cat. I never told H and he has never asked about any of the animals since he left. I guess thats a mystery we will never understand.
Take care.