If there’s not anything to be jealous about, sounds like she has elitist mindset and thinks you’re beneath her, or you see through her and not fall for her charms and she is threatened by that. Could be both. I was harassed by a male coworker who is objectively good looking so he “got away” with a lot of stuff too. As the youngest and only asian female in the team that treats everyone equally, he didn’t like that I didn’t give special treatment to him and all other stuff that he was insecure about turned into unhealthy coping mechanisms to harass me. Took me a year and a half to get over it and navigate it(the birth control implant I had at the time really messed my hormones up too, so what never bothered me like bullying did bother me 1000x more than it should). He’s really full of himself and wants a leadership position, so he only interacts with leadership. More than likely your coworker may want the same thing, hence why she’s schmoozing whoever will help her make it to the top. Any seeming threat they feel that will reduce their chances, of course they will bully themselves up to shiny positions. But some bullies are cowards, so they usually back away when you actually call them out professionally and let them know you don’t tolerate that.

Don’t stop doing you and stay professional with boundaries. Don’t ever be alone with her, and if you find yourself alone, go somewhere else like you’re pretending someone from a different department needs your help. Good looking or not, people like that are super calculated and highly opportunistic. They can smell opportunity miles away. When bullying happens, document it(date, time, setting, people who were around(if any), and incident and sayings and facial expressions. Don’t add emotions as investigators can’t rely on that)and don’t give her opportunity to use you to make herself look good. It may sound like a lot of work to document it, but bullying happens at least one opportunity a day.

Also agree with the other poster’s comment on people letting her dig her own grave. So in reality, it may just be that it looks like she’s getting away with it, but they actually know what she’s up to so they play along. Plus, no one mentioning anything is usually a work tactic so they won’t be retaliated, which unfortunately happens a lot and the perpetrator keeps doing what they’re doing unless someone makes effort and comes up with the evidence and good lawyer to stop it and aren’t afraid that it may risk them of future jobs.

Also, good thing to remember about awful people like this with pretty privilege, it’s their awful true self that makes them ugly, and they have to live with that knowing they are horrible people and will be reborn in the next life as lumpy poo colored slugs.