Tracy is one of the mods on our forum dairygoatinfo.com ask her, she is an Alpine breeder, shows all over up there and likely knows most folks. She at least could tell you if the bloodline is a good one. Make sure you get the breeding back in writing so she doesn't change her mind this winter when you have no buck to breed to.
A grade simply means she is recorded on appearance, she is not registered as in purebred etc...only her doelings if you bred her to a purebred or american Nubian buck would be registerable, depending upon what her paperwork says. If she is a good milker, will let you lead her out of her pen, put her up on the milkstand and milk her get her if you want the milk.
Biggy is when you are at breeders houses is to do alot of this yourself. The last two I sold they had 4 daughters. I not only had them go get the doe but put her up on the stand, clean their teats, milk them and then put them back into their stalls...I stood in front of the fan and talked to mom and dad

there are lots of tricks that when you get the doe home you realize you have purchase a less than milkstand ready doe. Also taste the milk, even fresh out of the doe it should be sweet and creamy, albeit warm.
Did you see the testing results? Or did she just tell you? Vicki