Sounds like things are moving in the right direction.

Can you write a note with your mom and put it some place where she will see it every day about the upcoming move? I did that with Aunt Bertha, and to my surprise, moving day went without a hitch. I was stunned. But we had written that note together, and looked at it every day and read it aloud - maybe we somehow moved it into longer-term memory, I will never know.