
Hi,
I bet you're cross with your mother for starting this!
With luck when you move house the new surroundings (and absence of your mother!) will be enough of a change of situation to disrupt the routine. Other options include crating the pup at night, and letting her get on with it just as might do with a new puppy. It may take several sleepless nights, but sometimes it's the only way to break a bad habit like this.
Good luck.