What does it mean if a girl says "can't talk right now" over text?

Anonymous
So I've been texting with a girl a lot. We are really close. She told me the previous day that we will chat today and I texted her but she suddenly said "cant talk right now sorry". I wonder why she said that. Is she doing or going through something or she suddenly no longer wants to talk to me?
What does it mean if a girl says "can't talk right now" over text?
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