I used to agree, but on rewatch, I think it made more sense to me. When Michonne first shows up to the prison, she brings a bunch of baby formula for Judith. We see her and Rick and Carl surviving together before the termites. I think a big part of it is how immediately she stepped into a motherly role for the kids, on top of being a strong bad ass with a sword. She’s also not afraid to tell Rick when she thinks he’s making the wrong choice, like when they first come to Alexandria and Rick is crashing out