Congrats you your foal to be!! I am for sure subscribing!!!
As for the LWO, it HAS been found in Tobianos in VERY RARE scenarios... I looked up the dam's history online and she is from a very prominent line of tobianos and solids so I really wouldn't worry about that at all!! Although you could get a Tovero which they can potentially carry LWO. But I am sure you are fine in this situation.
The dam and sire have a lot of color combinations in the history, you could be looking at anything from chestnuts, bays, blacks or grays! All with possibilities of being solid, tovero, tobiano, or overo!! Its a guessing game
You should start posting some photos of her progress daily if possible for us to watch since she could be going here soon! The biggest indicator I had with my mare last year was her vulva, long and deep deep red, my mare waxed for almost 2 weeks before she foaled.
Good luck with everything!