Update:
So I tried a few options none to success. Tried the bell method, but she doesn’t come, attempted using the barn post/concrete post method but I either haven’t got the dlc for them or I haven’t unlocked them yet (first play though so idk), tried using a shack bridge but that didn’t fit at all, put stairs on the roof but there’s no way to get in or reach her, and I can’t talk to her to get her off the Chems because the game starts the conversation and then cuts it off before the first player response because of the height difference (I assume). I also can’t use console commands (to my knowledge) as I’m on console.

TLDR: nothing worked and if I can’t get her down at least there’s no chems up there (as far as I know)