What does it mean when she messages "Hey yea sorry! I've been really busy!"?

Anonymous
A week ago, I matched with a girl on a dating app called Hinge. The conversation started out great and we talked for a while, always replying within 20 minutes. We mostly talked about food we both didn't like, then I asked her about what food she liked and she didn't reply. I waited a few days, then I sent a message asking her what her weekend plans were. Then 2 days later she replies, "Hey yea sorry! I've been really busy!"

I think I should un-match with her.

I don't understand what went wrong. I feel like she's curving me for no reason. I feel like if she liked me, she'd talk to me more. Why do girls match with guys they don't like? Why can't she just say she's not interested? I don't see why not, but I'll take rejection over being strung along.
What does it mean when she messages "Hey yea sorry! I've been really busy!"?
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