She seems to be sitting on something, it could be her knees, or it could be a cushion, or maybe a booster seat if the artist intends to make a gag out of it.
I fixed an error in the translation. The structure したって here basically means the same thing as しても, much like だって is often used for でも. In the end, it changes the meaning of the sentence quite a bit.
Does that really say "Super BIG whatsit?" I want a super big whatsit. Whatsit is a fun word. That food is expressive, saying Uu~ in the last panel as well.
Even if you cast those wistful, puppy-dog eyes in my direction, I'm not sharing with you.RevengeUu~☆ignoreLunchtime.Ooh, pudding!The school provides the meals, but Remilia still manages to shove her privilege in our faces.Remilia's TableMy, Letty....I-If you come over a little closer, I might be willing to share, y'know?Uu~☆I don't want any.Super BIG Whatsithuge