It was already evening, time was going. Before they knew it, everywhere would begin darkening.
And the picture taking wouldn't be able to hold anymore 'cause everywhere was already darkening...the pictures wouldn't be clear anymore.
Again, it wouldn't be fair for more people to be adding up to the people that were waiting to take pictures with him. Even if more adds up, she doesn't want to be part of them.
Why? Because he needed to go home, he's been taking pictures with people for minutes now. A time might come when he might get tired 'cause people weren't considering him and his time.
He might need to engage in something after leaving this place. But because of the picture taking and all that, he might not be able to anymore.
..People's humility shouldn't be taken for granted.
Putting all these into consideration, she decided not to go join the people waiting to take pictures with him even though she really wanted to take pictures with him.