Why do some of my messages to my friend not display the delivered message?

They don't say delivered or not delivered, it's just blank. The one above it says delivered that I sent two days ago but this one doesn't. This happens fairly often with this friend… I know her phone isn't dead since she's been posting and liking my photos on ig but it still doesn't say delivered under it. She has an iPhone 6s if it helps.

It depends

Their phone is probably not on or they don't have service.
EDIT sorry didn't realize you said her phone wasn't dead… Maybe she blocked your number

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