I'm knitting some Jaywalkers out of Bearfoot right at the moment, they definitely do stripe, but in a subtle way.
I think I was thinking of MC's weaver's wool. Oops! But Bearfoot does have a subtle, variegated type pattern (which will sometimes stripe if the knit item is narrow enough; if it's a large knit object, the variegated color will stretch over a large area and will probably never line up in stripes), but not well-defined stripes. That's what I meant. In other words, she should expect something like this:
(link to sweater at MC's website
and not like this:
One is the striping you sometimes
get with variegated yarn, and the other is a carefully designed color repeat meant to give you a specific pattern at a certain gauge.