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"Presumably, since Mary is also in Gryffindor"
Is she? Where does it say that?
She is able to go into the Gryffindor common room to get Lily when Severus is "threatening to sleep out [there]", so either she's a Gryffindor or someone has leaked the password to her (in which case, why would she be heading there around bedtime, and not to her own common room?).
We don't even know that she's someone Lily knows personally.
It's true that we don't know whether they are really friends or what, but Mary is personally acquainted with her enough for Lily to refer to her simply by first name ("Mary told me") and for it to be ok for Mary to go into her dormitory either around bedtime or after (Lily is wearing a dressing gown). The simplest conclusion is that Mary and Lily are both Gryffindor girls of the same year.
Is she? Where does it say that?
She is able to go into the Gryffindor common room to get Lily when Severus is "threatening to sleep out [there]", so either she's a Gryffindor or someone has leaked the password to her (in which case, why would she be heading there around bedtime, and not to her own common room?).
We don't even know that she's someone Lily knows personally.
It's true that we don't know whether they are really friends or what, but Mary is personally acquainted with her enough for Lily to refer to her simply by first name ("Mary told me") and for it to be ok for Mary to go into her dormitory either around bedtime or after (Lily is wearing a dressing gown). The simplest conclusion is that Mary and Lily are both Gryffindor girls of the same year.