She stopped texting me mid-conversation? Do I text her back?

Me and this girl that I like hangout and text all the time but yesterday we were texting and all of a sudden she didn't text me back and she usually does. I haven't texted her since as I am waiting for her. Should I text her and ask what's up? or should I wait a bit? or is she hinting that she doesn't want me to talk her ? Is this a test ? Please help.
She stopped texting me mid-conversation? Do I text her back?
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