Well, hopefully your breeder didn't already know that there is LS in her lines

It could just have popped up, that does happen, from what I understand. I'd approach her nicely (you catch more flies with honey

) and go from there. Hopefully they're a good breeder who cares.
Wishing your baby all the best! Definitely check into Dr. Tobias, I have seen many babies here that are now thriving because of that doc