She keeps cutting the conversation short. Is she not interested?

I've been talking to this girl. As of late, she stop replying to messages mid conversation. 3 times to be exact. First time I just replied "yep". Second time, I replied something about taking messages the wrong way at times. Yesterday, I was talking about trust and she stopped.

I know we're not dating, but it's out of respect to just say something and end the conversation. Worst part, she looked at my snap chat after she stopped. Should I address this to her? Is this a test?
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+1 y
Don't want to come off as needy, but it's out of respect.
She keeps cutting the conversation short. Is she not interested?
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