Friend being a stalker?

So me and my best friend, we'll call her Lisa, have this Youtube channel. We make Minecraft videos and comic dubs. We only have like 75 subscribers, so we're not very popular. We made this friend, we'll call her Elizabeth, who apparently is a big fan of the channel. But we don't really treat her like a fan, we treat her like a good friend, because she is one. We all talk a lot on a chatting app called Discord, it's kinda like Skype. So Elizabeth accidentally sent a screenshot of her desktop. It looked exactly like Lisa's desktop. Elizabeth admitted that whenever Lisa sends screenshots, or does screen shares, she copies what her pinned apps look like. So her computer looks exactly the same. Her brother, we'll call him Toby, he was saying that her room was decorated with things from our channel. Like quotes we've said, and a picture of my Minecraft skin. So me and Lisa are a little creeped and weirded out. We're not sure what to do about it.