Well, if she spends so much time in her cage she chews walls, and you’re concerned she’s bored, instead of adding another rabbit you may not have time for, you instead let her out of the cage and spend more time with her? More bonding time with her “family” will do her much better than adding a stranger to her territory, I would think. I don’t mean this to sound harsh (I’m often admonished for my blunt speech, so I apologize in advance), but it our responsibility to make our furry friends happy. Adding a new animal she might see as a challenger or invader (She HAS been queen of her territory for 7 years after all) and putting the onus on the new animal to make her happy is unfair to them both.
And as a multitude of posts will show, bonding two rabbits, strangers to each other, is a LOT of extra work and sometimes fraught with fights, injury, and hurt feelings and heartache on everyone’s part, sometimes requiring you rehome a rabbit you just got.
Easier, I think, to work to make your current rabbit happier.