Someone is selling my sourdough starter and I’m not sure how to feel

Backstory: I crafted my starter from scratch a couple years ago and have been baking with it weekly ever since. A little over a year ago I had some people asking to buy some starter. Sometimes I’d give it away but others insisted on paying for it and recommended selling it online. I decided to try it and it’s been a great source of a bit of extra money - not much but I also enjoy getting people started and helping them learn. I only charge a few bucks but I include 150g of starter in a brand new jar and provide them with a multi page printed guide that I’ve worked on over time. It includes tips, recipes, feeding instructions, troubleshooting - all written by me - and info for how to get to my online video tutorials for beginners. I’m in a small-ish town and sell anywhere from 5-25 jars of my starter each month. There’s also only a couple other people who sell starter in my county.

3 weeks ago I sold a jar to someone who proceeded to ask me questions for several days after the sale. This happens occasionally but I’m happy to help with people getting started with their sourdough journey. She reiterated that she had no idea what she was doing and was really struggling despite the instructions I’d given her and all the video links I sent. Today I open up marketplace and see a new listing for sourdough starter. I check it out only to see the person selling it is this same woman who bought from me 3 weeks ago. She’s selling it for the same price and I’m pretty sure she’s also selling it with my instruction guide that I created. I completely understand that I’m not the first person to sell my starter obviously - but this just feels weird and icky. I’ve worked hard on my listings and this week will finally be selling my breads under cottage baking laws. Should I say something to them? Is it somewhat of a violation for her to be selling my user guide too?

TLDR: 3 weeks ago someone bought a jar of my sourdough starter and instruction guide and is now feeding and selling it as their own.