Ginny, my little rescue girl had a similar start in life, was semi feral when she was rescued at 8 weeks old, and was then in foster care until i got her at 4 months old. Within a week or so she had really, really bonded with me,
she is still skittish with other people, and i don't think she'll ever be the type of cat to like strangers, but the bond she has with me (and even to an extent, with my young son) is sooooooooo strong.
Penguin on t'other hand was raised in a home and very well socialised, and purrs if you so much as look at her
but she loves everyone equally rather than having the almost clingy attachment to me.
Basically that was a long way of saying that given time i'm sure she'll be the most loyal cat you could wish for.
Congrats on your new additions BTW, and l;ooking forward to pics?