This is also a good argument that not every girl of the Tawawa universe is built like Mt Fuji. The mother here is a good bit smaller than Maegami-chan - almost anime-average
I don't know, the focus on her wasn't that clear in panels 1 and 3, and panel 2 (which has surprising detail of her face for a nameless background character) completely obscures most of her body, including her chest area.