For Maya the only thing that comes to mind a a film reel. Sadly, her movie hobby hasn't come up much recently so it feels a little bland. I guess you could go with just one female symbol too (she is a feminist, after all), but again it's a bit underwhelming.
The Bella one doesn't bother me. Without knowing Bella joined a sorority named OMG in her youth, the Omega doesn't mean much. It's not like we're introduced to an OMG chapter on campus before Bella tells her story. For all the clueless newbie can tell, it might mean Bella was the founder of Time Lord society.
I suppose you could replace it with a spatula if you really wanted to. Or an axe, if you just want to stir up the hornets.