Stephanie needed an op to cut out the venom.
Four days later, after her condition worsened, she had another to halt the infection — and is due to have a skin graft tomorrow.
The childcare student said: “I have a hole in my hand. It’s so upsetting.”
Stephanie, of Enfield, North London, was watching Paranormal Activity: The Marked Ones.
She said: “It’s about a teenager marked by a devil — and I was marked by a devilish spider.”
The false widow is the most venomous UK spider, although its bites have caused no reported deaths.
It likes dark, warm buildings to escape the cold — and numbers have surged to up to 10million.
Last night Cineworld said pest experts were inspecting the cinema.