So glad to hear you're liking it! My goal was to create a tense atmosphere that didn't rely on jump scares since that always prevents me from playing horror games (I'm a big scaredy-cat when it comes to that haha) so I'm stoked to hear you say that!
SPOILERS BELOW
Bruh's reply is correct: you'll need to get Heather's hair by typing CUT HAIR when you're in the same room as her. If you type it when you're in any other room, you'll cut your own hair. (You can get both items though, so don't feel like once you have one in your inventory you can't get the other.)
Happy playing! Feel free to reply again if you're stuck!