Emoji meaning from girls?

I've kind of been talking to a girl i can't really tell if she's interested or not but i texted her and she sent me an emoji but I don't know what she's trying to say. it was the expressionless one the blank face not the neutral one. i asked her to hangout with me she said she couldnt she's with friends then sent me 3 of those faces. whats she trying to say?
Emoji meaning from girls?
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