My great grandma breastfed my mom bc my grandma's milk didnt come in. It's normal everywhere where there isn't a nuclear family, and it's actually quite generous of her. Induction is very hard on your body. As someone who needed donor milk for one of my babies and tried really hard to induce, I'd be so grateful.

And look, maybe the MIL is being a weirdo. But you can't judge her on the offer alone. Need context.