I think one of my students had WLS. Of course we all know it's not something you just go around asking people, and considering I haven't told many people and am covering my face on pictures so my students don't have easily downloaded fat pics of me (without a face, there's no proof!), it would probably be a bit hypocritical to ask.
But in any case, good for her. She's looking great and she's going to have the energy to go with her vivacious personality.