How can long have you known this person? Because if you do not know each other well, then an 'I love you' may not be the best option.
But back to the actual question; you can say, 'I love you' when you have shared a good joke, or are talking about something romantic or just say, 'I love you' when she says or does something cute. Say it without following it up with a huge laughter, look into her eyes and smile after having said it. Maybe kiss her, or just hold her hand and get back to what you were doing.
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