When she falls asleep on FaceTime what does it mean?

We text front the time we wake up until it’s to the time to fall asleep. Every time we FaceTime we stay on the phone for hours. When we FaceTime at night and she gets tired I tell her that she can hang up and go to bed and she keeps saying No and stay on the phone and falls asleep. What does this mean?
When she falls asleep on FaceTime what does it mean?
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