If she’s marking specifically you, firstly be flattered and happy. She’s claiming you because she likes you, haha. Wick sprayed me exclusively, and unfortunately, avoidance is really the best option. Just getting up and walking away or distracting her with something else if you see her getting ready to mark you. Potentially getting her a stuffed animal may curb her need to mark what she loves with that, but no guarantees a rabbit will accept the stuffed animal you choose. If you have her spayed, which is recommended for a plethora of valid, strong reasons, it will drastically reduce/eliminate the instinctual urge to mark territory and claim items via marking. Don’t be too discouraged. You’ve only had her for a bit. I’ve had Wick for over a year and every 3 weeks I swear I understand what his behaviors will be like, but then it evolves and changes.
Marking the sofa is very common, because it’s 1) soft, 2) elevated (able to see a lot of the environment = prime location to claim), and 3) it’s a large space with things to climb, so it seems quite vast, so marking a lot seems instinctual.
You can try the towel/fabric method, which is getting a piece of cloth/fabric which has her scent on it, and keep it on the sofa. Smelling this may deter her need to re-mark the sofa. A good way to get a scent on fabric is placing it where she eats for a few days, rubbing it on her, and just generally letting her do her thing on it.
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.