Then she said, in between the lines
It’s not clear whether he’s saying “in between” or “read between” here;
“In between” would mean that in the next few lines, Kendrick is paraphrasing what she’s saying to him as they get closer at this party.
“Read between” means that she’s telling him to read between the lines of what she said about them being crack babies, i.e. she shouldn’t need to explain to him that everyone born in the ‘80s is a crack baby.
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