For someone who loves laying down the law so much, I feel like Lauren does a tit job of telling Ruby to sort her act out. She's fucked over two of Lauren's close friends with Rez and the best she can serve is "it feels to me like you're a bit confused about Rez, Ruby". Confused? She goes out of her way to sabotage and destroy any burgeoning romance of his then gets bored of him when she's won at her little game and he's no longer interested in anyone else. All with a big smirk on her face. I remember Lauren giggling and indulging Ruby's gossip about her flirting with Rez when he was dating Bella. Bit shady from Bella's supposed best friend.
Lauren's happy to be Billy Big Bollocks to anyone she doesn't want turning on her in case she ends up being ostracised from the group. Easier for her to go ape on someone she considers to be small fry, like Temps. Liv fully mugged her off when she falsely accused her of parading her romance with Tristan, and for some reason Lauren was the one who ended up crying and grovelling for an apology. Weird reaction from such a feisty, self-assured individual.