Not really, this type of comic is quite common and extremely predictable. They all try to be subversive in the exact same way (being kind initially and later surprising the audience with cruelty) that they ironically end up being cliche and foreseeable. It would have been way too boring if the grandma just accepted the baby, of course the comic was going to take a different turn.
Yeah, I wouldn’t expect less from anyone’s Nona. Especially those who lived during the Depression Era. They can make sugarless chocolate cake taste like Death By Chocolate delicious, it’s nothing to do a meal based on fluffies.