I think that ad is offputting.
Seems like she is trying to breed tiny yorkies and trying to show that on the pictures (ex.putting a soda can beside the dog and putting the puppies in a little bowl). Seems like she is selling Teacups or Tiny Toys which usially are not healthy and can have many problems.
Also, a dog that is 8-9inch tall and only weighs 2.5-3lbs sounds very fragile to me. My dogs are around 9inch tall
(very good medium size) and they weigh around 7lbs
(compact strong bodies). A 9 inch dog that is 5.5lbs is usially pretty thin
(common for young dogs) so a 9 inch dog that is 2.5lbs must be..emaciated....
or at least very very thin.
I would look for a breeder that is breeding the Yorkie according to the Yorkshire Terrier standard.
AKC STANDARD:
Weight
Must not exceed seven pounds.
FCI STANDARD:
WEIGHT : Weight up to 3,1 kg (7 lbs).
So 2,5 - 3 lbs is more than two times lighter than the maximum weight, which I think is too far from the standard. I think that a 5.5lbs Yorkie is a good size, small but strong.
My friend has a very fragile built small Yorkie but she broke her leg recently from a small fall, where a regular yorkie would have been just fine.
A Yorkie should be a small strong dog, a little powerful terrier dog with much intelligence.
So should we buy from people who are breeding dogs that are much more fragile/weaker/unhealthy than the regular yorkies
(no offence to the people who already have a tinytiny/fragile yorkie, I am just against breeding them intentionally that way)
And a place that sells ALOT of puppies does NOT sound good to me, that I would usially call ,,a person that produces puppies" not a breeder.
I would look better and see if you find another breeder, I would at least never buy a puppy without visiting the breeder and seeing her dogs and the inviroment that the puppies are living in.