If a girl gives you a last look before she leaves?

She was on one side of these double doors and I was standing across the room then she holds eye contact for a ridiculous amount of time, and smiles. I kind of knew her. She stops before opening them and looks at me and starts smiling. Her eyes were glistening too. Lasted at least 10 seconds then She walks off and leaves.
If a girl gives you a last look before she leaves?
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