I backed up from a parking spot into a car, my fault, this person didnt report it for two months deny? or no?

since it's been two months the small collision happened without any report. can i deny ?
her insurance called me 2 days ago for the first time.
my car has nothing , her car was a little dented.
Update: i gave her all my information address and phone number , i just dont understand why she waited that long to report.
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