Well, if we're establishing how long everyone's been in the group at least I think it makes sense for Lucille to be a founding member.  She's the kind of person who'd jump at the call, really.

As for how she feels about everyone else, well... She's just kind of overly friendly, I guess?  I mean I guess it depends on how they feel about her in return, but even then she's the type who just wants to be friends with everyone.