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I know everyone's probably thinking this is Emily signaling that she's okay with Bonbi's relationship with Seth. But maybe Bonbi just gets herself super hungry and complains about it when they're playing LoL or Overwatch together, and mentions sandwiches loads. Emily probably doesn't even know the hidden meaning of it. Of course it has the hidden meaning of Seth, but Bonbi also just likes sandwiches in general. Bonbi only eats like four kinds of foods anyway. Sandwiches, ramen, chips and gum.
I just don't think this is conclusive evidence of anything except that Emily wants to give Bonbi something that she likes, and Bonbi is being appreciative that she listens to her. Maybe I'm being naive but I think more evidence is required to prove anything. I think it's just cute and wholesome.