If a girl's voice gets very soft when she apologizes to a guy, how does feel about the guy?

Recently, I (23 year old male) and a female co-worker (22 year old) ran into each other during work. She was startled. I immediately apologized and so did she. I apologized in a normal voice, while her voice was very soft when she apologized. Did I creep her out?

If a girl's voice gets very soft when she apologizes to a guy, how does feel about the guy?
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