Dang it really makes it much more depressing that she's only willing to use one Pokemon, even if it was a type disadvantage.
And she only was able to win because Nessa's were weakened :/ That really must be quite depressing, especially on Shield's end.. Not going to lie, I hope she gets new teammates too and shows her it's fine to get more. (Also the only ones I really like on her team were Falinks, Eiscue, and Toxicitry xD personally anyways)
I hope Sword can cheer her up