I've gotten the bow and arrow, and Cathedral card and met with Ewan. He didn't offer me the zipline for the bow and arrow, and I can't further dialogue with him. What to do?

Has Nancy already seen that Bridget is spying in her room and clicked on that room across her window?

Have you done this part?
Face the mirror on the table and see a bright reflection.
Nancy checks the window to see Bridget acting weird. Nancy wants to check her room.

Yes, MaG..I did that but it was before I'd actually won the bow and arrow. I think I've done a few things out of sequence, but should be able to get the zipline from Ewan. Not sure what to do.

Check the To Do list and see what actions need to be done.
Also check your bow and arrow and see if it can be used on the window. It might already be primed after the talk with Ewan.