She says "we should hang out sometime"
Verdict first
"Sometime" is the place where plans go to die. If she says it, take her up on it right away with a day and a place. If she dodges a specific invite, you have your answer.
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Turn it into a plan
Reply with something concrete — day, time, simple plan:
If she's vague again
"Maybe, I'll let you know" after a specific invite is a soft no. Don't chase with more dates. Reply once, warmly, and leave the next move to her:
Verdict
Vague invites get vague answers. Name the day.
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