There is an easy way to tell if you should get another bird. Ask yourself the following;
Do you desperately want another bird, even if the two hate each other and try to kill each other and can never be allowed out at the same time EVER and you have to divide your attention between them, causing your other bird to have to be locked up all the time? What about if the two birds absolutely adore each other but both decide they hate YOU and start biting you and want nothing to do with you ever again? If yes, you would still want the bird even if one of these things happens, then yes! Get another bird! If not, then don't.
Some side notes; your bird might love the attention she gets for destroying things, but attention or not parrots are destructo machines and will shred anything they can just because they are parrots. And twice as many parrots means twice as much destruction, not less.
Also, if you bring home a new bird and put it in your bird's cage you are signing a death warrant. Parrots are extremely territorial creatures and your bird will do everything in her power to kill an invader to her cage. Because you let her roam the whole house, this likely applies to the whole house not just the cage, and introducing a second bird safely would be extremely tricky.
In general, adding a second bird to "fix" any sort of problem with the first bird is a doomed venture. It almost always backfires and the human ends up in twice the hole they were in before.
If the problem is a destructive parrot, the answer is proper training, boundaries, and more exciting toys that they are ALLOWED to destroy.
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