Warped by Maurissa Guibord
Tessa Brody lives with her father above their bookstore. When her father decides he need more books for their bookstore they go to an auction where they buy four boxes of books and one extra. Inside that box were a tapestry and a book with the words TEXO VITA on it. Tessa convinced her father to let her keep the tapestry and the book so she hung the tapestry in her bedroom wall.
The tapestry had a unicorn running in a forest with a scratch on its cheek that was bloody on it. When Tessa touched the unicorns bloody cheek she had some sort of vision or something and she saw a girl that looked just like her running in a forest and a handsome man named William de Chaucy looking for her.
Yes, Tessa had a past life and she felt like she knew the unicorn in the tapestry some how. And since she first touched the tapestry she kept having these weird dreams where this guy William de Chaucy got changed into a unicorn by an old lady named Gray Lily and she put him in her tapestry.