Hi Skippy
Saga has stubby whiskers listed between Curious and Frazzled, so they're middle-of-the-road in terms of dominance. As Kay points out, they came out in the winter collection time.
If you want to keep them, I think one way to go would be to get a nice partner with super recessive whiskers and then keep traiting up the line using slightly less recessive whiskers (that way, if your stubby girl tosses her hidden whiskers you'll be able to tell as the shown ones will be more recessive than stubby). Or, if you can't find a suitable partner with super recessive whiskers, work the other way -start with a nice partner with Frazzled then keep going towards recessive (this way probably requires better knowledge of the partner's hiddens than the first one). Have some treats available to reward Stubby girl when she doesn't toss her hidden whiskers. After a first generation of stubby whiskered babies, you can sibling breed and you'll have a better knowledge of what's back there. And/or backbreed a stubby whiskered boy to stubby girl mum, even if the chances for better overall traited babies are slimmer that way.
And in the meantime I'd try to find out more about dad's hidden whiskers, and to get well traited partner(s) with Mysterious whiskers for mum, as I too suspect that she's the one hiding the stubby (just a hunch, depending on dad's line of course, as they're not LE whiskers)