i have done a number of Jinney Beyer quilts- i have never had a problem with bleeding fabrics from her- i love her border prints & use them alot.
i tend to prewash yardage- but never pre-cuts or kit fabrics - if i have a bleeder in a kit or pre-cut i may wash that one- more often i simply replace it...but i've never had that problem from any of Jinney's fabrics.
if you are concerned with any bleeding do a color test and check them- wet one- rub with a paper towel or piece of muslin- if color comes off- prewash- if color does not come off-don't bother.