I’ve seen adds from BloomChic and have been surprised at how decent some of their dresses are. I would definitely wear some of them. You’ve got to wade through some immodest ones though. I’ve seen some dresses from Shein that are modest as well.
I think both of those places use China to produce their products as cheap as they are. I don’t care for that.
Is she interested in sewing? That can really widen her possibilities.