I'm just some random person on the internet, so I'll be frank.
- You need to see if the person you love the most actually sees Rick as just a friend. From the way you described Rick and her covered up for him, I don't think there's any reason one would go so far to sacrifice one's mental health and career for some "best" friends. It might be worthwhile to understand their relationship before you attempt to help your girl. If she does not have a crush or secretly in love with Rick, then you might go ahead and help. Otherwise, don't get involved in a romantic workplace relationship.
- If you are her significant other, and after you have verified that she is indeed being manipulated by a friend, you can suggest your girl to cut off contact with Ricky, either slowly or immediately. The less she associates with him, the less likely she'll get dragged into his bullshits.
- She needs some other friends than Rick so she can have some allies at work. There are people who can manipulate others to their side to isolate their target, and your girl should preemptively avoid being isolated at work. It makes doing your job very difficult. Since you said "everyone likes and listens to her", I'm assuming this won't be too hard.
- Your girl needs to make herself valuable to the company. Have her comes up with simple and executable ideas and do it on her own time. If she's making money, no sane management would get rid of her based on some guy's opinion of her. In addition, doing more work would give her an excuse to not do anything Rick asks her. "Sorry, Rick, I'm too busy right now", "I got work, maybe later", "That's a good idea, you should ask A or B, I'm too swarmed".
There is one inconsistent description that you have. On first paragraph, you mentioned "she's a typical loner and desired friends", yet on the fourth, you said "everyone likes and listens to her". This is not adding up for me. If everyone listens to her, she should be in a power position, not Rick. I'm not getting the entire picture because I'm not you but you should see if your love is blinding you to some other unexplored angles of this issue.
She doesnt go out and hang out with people. But she's kind and softspoken so she doesn't normally interact with then unless needed. Got a certain charisma too, so she's well liked. Thanks for your input! We're having a hard time dealing with this.
I wish you guys the best of luck. Soft spoken people tend to be brushed over while being loud and obnoxious gets the credit. Hopefully her company will treat her well despite that Rick guy.