I agree with Lottielouise - it can take up to 9 months for hormones to drop off - she could be stuck in her mind in 'spring female bunny' mode as the Op was done right in the middle of this highly hormonally charged bunny season. I would just give it a bit more time.
I also agree with Michelleox, it could be for attention, to remind you to keep stroking, to ask you to stop, to ask you to move out of her territory, even though the flat is yours, she could consider it part of hers, it could be any scent/deo you are wearing? certain smells are reminiscent of pheremones....my male bun always bites us when we are wearing deo - I keep him well away from my armpits! :lol: Cos it blimmin' hurts!!
There are many things that she could potentially be communicating to you.
This may sound like a terribly intrusive question ....but female buns also respond to human female hormones and if you are perhaps menstrual she may be able to sense this. Does it only happen when she is climbing on your lap?
If she senses you are scared of her she will very quickly learn that her 'biting' has an effect. Rabbits learn by association...she bites, you back away or put her down or whatever it is she is trying to achieve....she bites again....you respond the same way.....she has learnt a new behaviour that works! I would, despite the pain.....ignore it! I would put a thick blanket or jumper on your lap first before she jumps on you....this way when she bites it won't hurt and therefore you won't react....she will hopefully learn that her behaviour has no effect. I would not give it any attention. I would also not confine her to her cage as punishment simply because rabbits use nipping as a means of communication, it is not naughty, it is just inappropriate, you need to avoid the behaviour or anything that triggers it, rather than punish it after the event. She will not understand this....dogs and humans yes... rabbits no. Her cage should also be a pleasant place to be....a reward....not a punishment. I would be wary of her making the wrong associations with her home. Good luck