Is my coworker being passive aggressive about being irritated with my questions?

She’s kind of a lead & one of the best, we work remotely & she’s responsive with answering my questions. Since last week & this week, I noticed something & wonder if it’s a genuine mistake. I sent her an IM & her usual response is “looking” meaning she’s checking the file I’m asking about. But last week & this week she typed “LOOKING”, caps always comes across as yelling. Then right away she edits the message & puts it in lowercase. She answers, her tone isn’t condescending, she continues to heart/like my msgs but that was strange. I’m kind of hesitant now, I need to be wary of my boss bringing this up. Ugh

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Is my coworker being passive aggressive about being irritated with my questions?
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