- Bran: you were wearing a very nice dress the night Ramsey raped you
- Sansa: ...
- Arya: you were wearing a very nice dress the day you watched father get beheaded
- Sansa: ... why was Jon my least favourite sibling when we were kids, I miss him
Just my own spec running wild here but if Hook is looking for something, and it happens to be his child, perhaps this "witch" has them and that could be the Tangled reference. So far Emma Booth only appears in 7x03, and she said she only filmed for 2 days. So while it seems like they're definitely saving her for a plot later on in the season, they will be introducing her fairly early and if the teases were referencing early things just like Alice, Tiana, etc, that still makes perfect sense.