they sell a wide variety of brands, so it isn't really a matter of assessing "her fabric".
there are a few brands that sell primarily in shops which do not impress me. (mind you, that is a purely personal opinion. if i named them, i'm sure many others would say they love those brands.)
what i have learned to do is to haunt her clearance pages. i buy only one yard of any brand i'm not personally familiar with. since the sale prices are so low, even if i am not wowzers over something, i know i still very definitely got my money's worth.
i make note of those brands i like and those that didn't thrill me and shop accordingly.
in the years i've been ordering from her site, i remember receiving only one fabric that was a total disappointment. everything else has been anything from a very good value for what i paid up to a fantastic bargain.