cat has dead kitten still in her?

I have a female cat. She is a sweet heart. I have no vet money. She gave birth to one dead kitten and I’m convinced she has more still in her. Is their any home remidy I could do to help her expell any left. I considered caster oil as I remeber some saying it is a remidy for humans to encourage birth. I have not given her anything but confort. Its been a week or more and her nipples have went down. But I still thing she may have a dead kitten in her. A friend told me she had a small dog expell a bead pup many months pass dew and it had became hard. Again presantly with out income and wish to help her any way I can. Thanks for any advice