@Picasso: I think that's crucial to understanding that scene. Consider also that when she had that last interaction with those women she was wearing this:
....When up till then, she always would dress in conservative business attire like this:
Molly wants to be a contender
by any means necessary - even if it means getting in good with the guy the ladies in the office dislike, but the boss seems to favor. Molly wants to be recognized so badly that she will use sex to get there - either by getting Taurean to notice her body or by actually fucking him. Meanwhile, she promised her female co-workers that she had plenty of spare time to give them helping them review the questions for the Patterson case. Now suddenly, when they're ready to collab with her
that night, instead (wearing a ho dress) she tells them she won't be available. Evidently, she'll be working with Taurean that night instead. Possibly on more than just job related stuff.
Molly is impatient, impulsive and reckless, and as we see from this move here, she burns bridges. She wants recognition at this job but doesn't want to first learn the system and social etiquette of that firm and then work within it to earn status. Now she has damaged her budding relationship with the two women and appears to them as a unreliable, two-faced opportunist. She's begun her journey on the road to career suicide.