Feminized and autoflowering are 2 totally different traits.
Fem beans from a non-ruderalis line still need a 12/12 schedule to trigger flowering.
Yes, you can make a mother from fem beans. But for the reasons already hashed and rehashed in the strains and seeds section, I think a mother should be grown from regular seeds. Remember, she's going to be the mother of all your future babies... you don't need any of them going herm on you because of weak genetics.