If she is eating/swallowing a lot of carpet, that is concerning since it can block her up literally. There are some items to think about for carpet tearing reduction, in my opinion:
1) Allow options to dissuade from tearing up the carpet. Provide other things to be shredded and chewed, such as wood toys (bunny safe wood).
2) Is this carpet tearing behavior a sign of stress/discomfort? For this, I’d think about what rabbit food she’s eating (is there enough hay?), if her energy levels are normal, and other items. The observation that she’s pooping/peeing as normal is a good sign, but looking at every angle would be beneficial. Another angle could be looking at her relationship with your other rabbit — is this a potential source of stress somehow?.. and then also the garage environment — are there noises, smells, etc.. that may be stressful for her there?
3) If there are specific spots that seem most tempting, try covering them with a tile or something so it cannot be accessed.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.