You'll find it easier to train your Yorkie then to train your mom.
I know that was the case with my husband.
Also, just a little advice, these little dogs really need to be fed more then once a day. Twice a day, at least. Just take the amount you give in the morning and cut it in half. Feed half in the morning and half in the eveing. That way she's still getting the same amount but it'll be better for her system to have it spread out more. If you see she's eat all of it and still looking for more, you can always up the amount you're giving her until you find the right portion.
Love her name, Zuzu! 8 months is a great age, they are still so curious about everything.