It's pretty obvious right from the beginning that The City is a "reality" show in name only.
Most of it is scripted, the girls don't even actually work - and the people on the show are practically "characters" in the fictional sense. I mean come on, the whole thing is set up - there's the "hero" there's the "villain" there's the "loyal best friend" there's the "dramatic love drama". Everyone is playing a role or giving a certain portrayal. So of course, Olivia isn't entirely (or only minimally) the olivia from the show. That should be pretty obvious imho.
There was a member on tfs who knows Olivia (went to the same school as her) and is familiar with her circle, and when the show aired, could spot a million fabrications right away.