Answer:
all-or-nothing thinking
Step-by-step explanation:
From the evidence given in the question text, we can see Monica's cognitive distortion is all-or-nothing thinking.
This kind of thinking means a person is going into the extremes - either they have exactly what they imagined in their heads, just the way they imagined it, or they are not willing to cooperate and settle for anything else. Everything is either absolutely good or absolutely bad.
Monica is not willing to settle for any other colleges; she is putting all her stakes only to Harvard and doesn't want to go anywhere else unless she does exactly what she wants.