Your puppy is very young and small and her bladder is still developing. Yorkies have a reputation for being difficult to potty train, but not all are. I believe small dogs are more difficult overall than larger dogs, so I would advise your mom to be patient.
Crate training is a lot of work. Is she pottying in her crate? Usually they don't, but it happens. I would take her to the pad or outside right after she eats, in addition to your other training schedule.
Use keywords like "go potty" and whenever she does do it in the right place, praise her profusely, "Good potty! Good girl!" and give her a tiny treat.
If you want to try a method other than crate training, you can confine her to a small area, as small as a 4 x 4 xpen, and have the pad available to her at all times. Then when you are ready for 100% outdoor potty, move the pad closer and closer to the door until you remove the pad completely.
Whichever training method you use, keep in mind that small dogs need frequent outings all of their lives -- not every 20 minutes, but frequent.
Good luck!
__________________ Kristin, Max and Teddy  |