What could not being available in the evening mean?

My boyfriends cousin met this women while gaming and she gave him her number and they have been talking for weeks now, he's interested in her but he has noticed that they only talk from half past 7 to 5 and then she's been making excuses that she keeps forgetting her charger at work, and this morning it was it's strange how his messages aren't coming through to her. He doesn't have any pictures of her nor social media and basically only got one picture of hers from a friend who he also met through gaming and this friend he's known for a year now. Any thoughts perhaps
Updates
3 mo
Turns out she is in a relationship and living with her boyfriend but she feels like they aren't together together anymore.
What could not being available in the evening mean?
Post Opinion