Seeking assistance

I'm a 23-year-old married man with two children, and I own a jewelry shop. My clients typically reach out to me via WhatsApp to discuss their orders and finalize jewelry designs. One of my clients, who has been coming to me for many years, recently began messaging me. She's very attractive and is studying LHV. I informed her that I'm married, but she responded that she likes me and suggested we could be friends. We started chatting casually as friends. My wife gave birth three weeks ago, so I asked her a few questions about my wife, and she was fine with it. She comes from a nice, wealthy family, so I doubt her interest is in my jewelry business. I'm unsure how to handle the situation because she flirts with me and sends me messages about how to please my wife better, among other things. I love my wife and children, and I've made that clear to her, but she insists that we're just friends.