The first is another former (or, she could still be in the sport) Olympic swimmer from Australia. She'd have to be a she, and could excel at any event aside from freestyle. She and Aubrey would have been the closer sort of frenemys I think; more friend then enemy but with definite competition between them, both in and out of the pool. She'd have to be close to the same age or a bit younger than Aubrey, and maybe just branching out from the sport to try her hand at another career path.
The second is for an older, pretentious sort of indie musician. I'd prefer another Australian (or at least Australia based) because I'm planning on sending her home for awhile, but I can work with something else, if I must. Can be guy or girl (although I imagine a guy more) and would have a big hand in helping Aubrey get off drugs and focused on her future and music. Okay, so (s)he'd basically be kicking her ass into straightening out. Could be a cousin, or a complete stranger.
Lastly, anymore partiers, celebs heavy into drinking and/or drugs. Aubrey currently only has one person in the community hardcore enough to party with her like she does, and they are getting kind of lonely!