She's very substantial and very typical of Polish, Polish/Russian breeding. She's got some very athletic lines, so I'm thinking she'll be a good riding horse. And she's very pretty.
Plain head (typical Polish profile)
Neck is a bit short
Shoulder is straighter than I like
and as another poster noted, she's not very free in her hip, doesn't reach under herself real well.
Since I'm guessing you're not buying a coming 8 year old mare for halter, none of that really means anything if you're looking at a trail horse or just everyday pleasure riding horse. I'd love to see conformation photos of her, those videos that don't stop and stand her up for conformation aren't real helpful.
If you're looking at her for a broodie, I'd look for a real fancy moving stallion with a gorgeous face and long hooky neck (that he's got history for passing on).
She also gives the impression of a small eye, but since this is not the clearest video, that's really more of a gut feeling than something I can tell for sure.