Am I Overreacting for calling this " a Stalking situation"?

Sorry for my bad English, I will try my best to explain. (Starlight is a nickname of the first annoying girl and not close to her real name) A few months ago there was a very annoying girl who was "begging" for my attention, no matter how many times I block her, I close my DMs, block the random people who she sends to talk to me on her behalf. She just keeps going to the point that she told one of my female friends that she is dating me just to find an excuse to push her away from me.

Now she sent to me her sister, which was a much worst person to deal with than her, she was giving me all of the flirty nicknames, making photos of us as if we were a couple, and even spam the comments after I closed my DMs, I had to block her in hopes of protecting my friend who made that effort for me before the crazy girl gets to her or bother her, I don't know if she is a threat since she lives in different country, but she and her sis always say that they want to do... Sexual things with me (Idk if I should mark the post as an NSFW or no since this post is not the main subject)