According to Gretchen, Sarah is her friend. According to Jenna on WWHL, Sarah went to one RH event with Shane. And according to everyone at Bowling Nigh (perhaps even Gretchen & Slade) Sarah was either drunk & disoriented or just plain crazy. For me, she was a copy of Camille's friend on BH--DeeDee. But both Vic & Gretch handled the situation better than the ladies of BH.
I simply think Bravo doesn't need to devote any more time to this satellite FOH. She's just not that interesting.