Oh I had a cat that had her kittens all over my clothes once too.. eeww lol

Our cats we have now.. one had kittens in a box under the house and the other had them behind the pine tree and her second little in our linen cupboard in the bathroom

I suggest closing all spaces you don't want her to go to and keep her a nice quiet dark spot just for her and maybe feed her close to it for a couple days and she might warm up to it

Good luck with your new kitties