Well it's not exactly the same look of surprise as the other girls.
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The upturned corners of her mouth do seem to form a slight smile.
honestly all of the girls expression is very basic, its only Maya who show some kind of reaction, the other girls have very standard basic expression, almost like normal. this is how they look like usually.
I assume they talk with the MC, because it's very first person pov. when other character interacting with each other, we usually see them from a third person perspective. They look at each other so we know who they talking.
may be Maya find out that there is no free tuition, and She is the only one who actually care about it. Lily, and Camilla not need and care about the money, Josy just get the money from her father recently.
all in all , they are all looks great