How to tell if a girl is blowing you off?

Anonymous
When girls decline your offer to hang out do they just add lines like maybe next week or suggest another time to sound nice?

I asked a girl to hang out but said she's busy and suggested another time when she's available. So I thought it was genuine and said let's meet then but she bailed that day saying that she's not feeling well.

I'm confused because I get the feeling that she's not interested but then why would you suggest another time in the first place? Why don't they just say sorry but I'm really busy so I don't think I could hang out and end it at that?

Just wondering what are some signs of blow off
Updates
+1 y
We're both students so I know she's busy and when she bailed she did sound like she was sorry and said next week for sure. But I just replied it's okay and no response from her since. Definitely seems like a blow off but just confused because based on my experience with her, she really didn't seem like the type to blow off people in that manner.
How to tell if a girl is blowing you off?
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