I don't think Ramona was filler at all, she's one of the best characters of Hotel IMO. The whole story about her parents really got to me

Pretty powerful story.
I re-watched the season over the past week or so and I have to say, I'm a bit mad Sally got payed so much dust. We only got a brief back story about her days as a junkie musician. We should have learned more about her childhood and upbringing, to explain why she turned out the way she did.