the mature move was to do what i did, which is to remove those risks and costs from my life
Except what happened was you had another meltdown and tried to kill SC to spite us. Trying to spin it as a mature move is a transparent post-rationalization.
She's admitted to being very forgetful, and judging by her inconsistencies in logic and stances making for "in the moment" patterns... she likely is stuck within post-rationalization as the norm. Her memory of that time is probably blurry if not lost to her now, and where she is presently is likely very foggy.
She likely has to figure what and why "Luna" would have done past events over and over, always after the fact once confronted over past behaviors, which would account for the constant changes in her narrative and why it's prone to showing elements of others portrayals of the past (even down to borrowing their words as if they were her own thoughts).
She can never revisit how she once felt, only how she feels in light of those past events presently. She legitimately has memory problems.