Old Cass from before Flashpoint was incredibly well adjusted, considering her upbringing. She was quirky and kind of awkward, but was a normal teenage girl underneath it all (most prominently showcased in the Gabrych run). Rebirth Cass is definitely a lot more emotionally stunted in comparison, and was quite honestly a wreck most of the time. So I don't think it necessarily lines up with her Rebirth self, but it is Infinite Frontier now... so who knows?