I'm I overthinking?

My girlfriend lives in a hostel where mobile phones are allowed only from 5-9.

She have classes till 4 and when i text her after 5, she sometimes takes so long to get reply. Her phone will be right with her. I'm sure she's seeing the texts and ignoring because her friends are with her.

Yes friends are there, but from morning to evening she's with them and after 9 she can spend time with them. She have no assignment and have nothing to do now.

I'm not asking to spend entire 5-9 with me. But why not at least reply for messages when her phone is right infront of her.

I always get annoyed by this.
Do you think I'm over reacting?
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I'm I overthinking?
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