Tacky, especially since it is somebody you don't know that well and she was inquiring about the whole "crowd".
However, I honestly don't have a problem if a close friend asks after a specific person if they really want them to be there, if they have a legitimate reason for not wanting to see them (ie they just broke up, etc) or if they are about to hang out with the person and need to know if they can bring up the party or not.
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