Am i allowed to be pissed off?

So I have recently set up my own business. I make handmade bows & headbands for babies and tiedye clothing for babies children & adults. I have spent alot of time trying to think of new ideas and how to improve my products. A local customer of mine, lives in the street next to me. She has bought products from me.. but yesterday posted a tiedye set she made herself. She also announced she may set up a shop doing it once shes had some practice. I also announced i was going to start doing personalised clothing too, and then so did she. I know im not the only one in the world to do this, but if you live next to someone, buy their products that you know they have worked hard to build up, you dont go and copy them. I know people say copying is a form of flattery but this is a joke. I am really annoyed as shes also got my regular customers and brand reps commenting on her photos too. It would be different if she done something different to make it her own but shes not. Am i being unreasonable?