some thoughts about the whole (not Jinora) Jorina thing. maybe some of you actually have kids. if Yes, some of the kids may have walked in on some, ahem, bedside action. that doesn't only happens in some TV shows.  Now, imagine a curious teenager, hellbent on finding out what she might have had a glimpse of, going on in some bedroom.
OF COURSE she would try some trickery and would use whatever disguise she can think of. naturally, not with too much planning ahead. read through the dialogue, it's in there. she comes up with what comes to her head first. a suspicious drink, paperbag, the whole "i'm totally Jorina and not Jinora", "look big boobs you love big", "i'm a spirit no this is a dream" shows that's not all planned through.  also, you could have decided to behave on the snow writing scene, or you could say No to the drink. (strangely i did choose No first and MC still drank it)..
of course, completionists will save on each decision, and try both paths from the save.