She's online but not replying to me?

This gal I've been talking to and went out on a date with is terrible with replying. She added me on Snapchat and Facebook. Sometimes we'll have a conversation where she replies immediately and other times I'll be left on delivered on Snapchat for hours but she's sharing stuff on Facebook during this time. Just trying to figure out if I need to do something different or just go with the flow? I understand the rule that she doesn't owe me a reply, and most of the stuff she shares is dark depressing stuff about being lonely and single so I'm real confused.
She's online but not replying to me?
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