That is odd timing.
I hate your mom lost her dog, especially in such a horrible way
I found the most amazing longhair black medium-sized mutt once. He was at a huge intersection running back and forth from car to car. I don't know if he was dumped or jumped out of a truck but it seemed he was checking each vehicle out "are you my people?"
I caught him and posted signs, add in the paper, called all the vets, talked to local businesses, called the pound, PD and SD and never could find an owner. Eventually, I adopted him out when I gave up all hope of finding his family
He would have been a GREAT dog for somebody like your mom.