Rochelle's erratic memory of her mediocre performance is most likely due to HINDSIGHT BIAS (Answer).
Hindsight bias refers to "an eye for predicting some events in life before they have even happened." It is that leaning many people have to see events as more predictable than they are.
It is also common to listen to people saying that they knew or had the feeling about the outcome of an event. It is the same that happened with Rochelle, once she realized her real grades, she remembered how poorly she did in college; it says: " She then started telling everyone she remembers being a pretty poor student".