Welcome to BB! It’s great that your female is spayed. It’s very important for health reasons. I’ll provide some information below, based on my experience with Wick.

Wick recently picked up jumping during pets. I thought it was just binkying, but some of it is actually venting frustration from being pet, because he too will just go to a different spot or… Pee on the sofa to be mean.

Try to stop petting her before she needs to stop you. With Wick, he’ll begin grooming me if I stop and he wanted more, but sometimes he’ll just be content with no more petting.

It’s only been a week, so I don’t think she’s necessarily aggressive.

There’s also a chance that you pet something that she perceived as bad and went to communicate that with you with a nip. Some rabbits are very defensive of their back legs, under belly, and butt, so when a hand swipes there, they can really get deterred.

Are you sure it was an aggressive nip?
One of my bunnies will honk when he’s eating or spending time with the bird.
Both bunnies will give light nips until you pet them.
Those nips don’t hurt, they feel more like someone pulling and lightly pinching your skin.
They also do it if I accidentally poke them in the eye/put my hand over their nose, which they don’t like.
Could it be one of the two options above?