Am I the only one who saw a person in two places at once and now feels guilty for not speaking up?

I was walking my dog last Tuesday and saw my coworker, Sarah, wave from her car driving past. Five minutes later, I saw her AGAIN, but this time she was jogging in the park wearing the SAME outfit. I didn't say anything because what if I was just confused and it causes drama? But now it's bothering me EVERY day. Do I tell her or is that stirring up trouble for no reason?