What's the Name of That Book??? discussion

This is about a girl who is a servant to a witch, the witch does something with a broom that is not sweeping!! a childrens book?? anyway the witch dies or something and the girl escapes, meets a unicorn in love with a frozen prince, ride the rainbow as they say, a older knight with red hair, and the girl seems to have a stone in her stomach, that weighs her down, she finds out that the witch kidnapped her, and made her distorted as she is really beautiful with long dark hair and called Fleur an old wizard chap, gives her clues to her past, and I remember the knight is seduced by a woman who feeds off of people, bit like galahad and the green knight, and then she will eventually marry the knight at the end, and the unicorn is reunited with his prince.... weird story but it stuck in my head

When did you read it? Remember the cover? Author male or female?

Please add some plot details to your header since hundreds of threads are also searching for YA fantasy and you want yours to stand out. If you are unable, a mod can help.

I'm pretty sure the book you're looking for is The Unlikely Ones by Mary Brown.

I think it is It was rereleased but I read it in the eighties, and left its mark thanks

I read it in the 90s and same for me :)

Plot details added to header.

This could help anyone in the future searching for the same book.