My interpretation of Kitty's backstory, with not much in canon to go on other than her bubbly personality, no visible marks and the horse featured in the title sequence in the bedroom she's shown in.
This is a work of fanfiction and I don't claim ownership of the characters. Ghosts was created, written by and stars Mathew Baynton, Simon Farnaby, Martha Howe-Douglas, Jim Howick, Laurence Rickard & Ben Willbond.
Copyright of the above & the BBC.
Characters and themes used within are done with the highest respect of the creators and used under the fair use exception to the British copyright law. Fair dealing is governed by Sections 29 and 30 of the Copyright, Designs and Patents Act 1988."
https://www.bl.uk/business-and-ip-centre/articles/fair-use-copyright-explained#
Everything that is underlined is a quote from or a reference to a show or song by the Idiots.