I'm very sorry, i've only ever played the full game outside the demo so I was unsure of what content was restricted, where can I go to find an answer to that question?
All good, questions are welcome on the discord server for subscribers and in the PMs on Boosty.
And without spoilers, my advice is smacking her with a stick or going back to previous location and back into location where she jumps you. There's 10% chance for her to spawn on certain locations.
