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What does it mean if a girl says "sounds fun" ?

Today, I told her that it's better if we don't go out tommorow because she's busy studying because they have exams and she is so busy studying. And few topics passed while we are texting. I told her, we should go to this place on Saturday I'm pretty sure you won't be busy next week. Then she just answered me "sounds fun". What does it mean? did she blew me off? or sounds fun means yeah, we should.
What does it mean if a girl says "sounds fun" ?
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