Oh she’s beautiful!
Sometimes buns hear or smell something weird that sets them off. Could there be a new smell or sound that she’s noticing? Or any other changes in the household?
Sometimes new bunnies also do better with a smaller space that is just “theirs”. It helps them feel less like they have a huge area to defend. So even if you plan to give her a whole room, you could keep her in a pen within that room for most of the day for now, so then when you come it she doesn’t immediately feel like you are invading her space.
Another thought is if it’s very quiet in the room she could just be startled by the noises. Some people will play quiet music for their buns to help with this.
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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.