My main tv policy is that I don’t just let him watch it by himself, so he has someone watching it with him to engage and talk about things he is seeing.
Currently we watch up to one episode of Show Me Show Me or Let’s Play a day at morning or afternoon snack time. Going to start with a couple of cartoons in the rotation soon too (Timmy Time, might see what Pablo is like), and I might try a film or two soon too. Mostly though I stay firm in the no more than one thing a day at the moment. He turns the tv off too now when it finishes, which is good progress from him screaming when it went off.
If she is really into Moana specifically, could you try maybe just putting the music on instead, if you get it in CD (even if you only pretend play the CD if you do it digitally instead) then you can give that as something as a replacement for the DVD?