Well, all I can say, is best of luck! Having a foal is always exciting. I'm breeding my mare in the spring to a Paint and to be honest, I didn't think of Lethal White either until I was looking on the prospective stallion's website and saw "OLWS - N/N" and then googled what it meant. If that hadn't been there, I may not have known either, I was just lucky enough that the stallion owner had it posted. You can't do anything now, since she is already in foal, except do your best to provide for your mare to have a healthy foal in the spring, which of course you will! And I find your mare's colouring neat. I'm not very good with genetics, but you may consider going to the color calculato
r, just for fun to see what it says.