Yeah, I just rewatched too. I think the misleading thing was “something new, to go with something borrowed.” That, combined with the fact that she draws it out of the air behind the dress, probably put the suggestion in our minds that she made it.
And there’s also the timeline issue of how did it get into Gerda’s stuff if they were on the mission to get it when they died. But I -think- that we’re going to find that was a thing that happened before their death somehow.
That quote is actually mentioned by Elsa in this episode:
“This was my present for Anna for her wedding. It was among our mother’s things, but to us it was new.”
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