Need some advice?

I am an Inspector for the state, I went to this salon to inspect and the owner and I like to talk about fishing as we have met before, she is very friendly. Her friend is sitting in the salon, who also owns a salon that I also inspected only once tho. I ask the friend not to leave yet as I was going to give her my business card. She just comes over to me and asks if I want her number, I said yes. She calls me when I’m on the way home. She says you thought I wouldn’t call huh. It was to setup an inspection but it also feels like she is interested as I called her today and she answered the phone by using my name. So my name and number are already in her phone. Should I keep it professional or is she flirting with me and interested? I’m a guy who is 50 and she is in her 40’s and went through a divorce. I mean the context was about her salon but she just willingly offered up her number and then called me. Any advice would be helpful.
Need some advice?
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