How can you tell someone is high of edibles (weed) through texting?

My friend recently bought some weed brownies, and she said she was going to eat them today. I texted her "hey" a few minutes ago, when she texts back, how will I be able to tell if she's high on the drug or not? (Without asking her)... what are some signs?
How can you tell someone is high of edibles (weed) through texting?
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