It's been awhile since I watched it, but is the plot hole?
I’ve searched my brain and… I think (this was nearly 25 years ago, so forgive me if this is inaccurate) it’s when she’s been “drugged” and put in the bath and it’s filling up with water… there was a shot of the water almost up to her nose or whatever, then what felt like a minute of other stuff going on, then another shot and the water hadn’t risen!? I feel like that was the point I shouted out!
I also seem to remember that she was actually conscious and biding her time to fight back, so, you know, she probably lifted her head up!!!
Teenage me was enraged, that I do remember…