Why is she leaving me on delivered but initiating/asking questions?

I have a friend who I slept with for the first time last week. We would text every night until late prior to this and on the weekends through the day.
since sleeping together she doesn’t stay up late to text and she didn’t text me during the day at the weekend. She has been leaving my messages on delivered all day too whereas before if she fell asleep she would at least look at them in the morning.
She has in the evening initiated conversation by texting first and has steered the conversation in a sexual manner though.
I'm confused why she would show interest but leave my messages on delivered/not text so much?

Why is she leaving me on delivered but initiating/asking questions?
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