What does it mean when she says, "something came up"?

Anonymous
A girl I'm seeing abruptly canceled meeting up. I said I was on my way. She said, "don't come out something came up". She then went dark. I haven't heard from her since mid afternoon yesterday. I don't know if we are dating. There's definitely energy going on and we've already gone on one date / outing but she's hard to read.
What does it mean when she says, "something came up"?
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