Hi Giuly I can understand you conundrum over wanting to clean up the mess she’s made with the fur but also if you clean it up, she may pull more fur out and you’ll have a bald bunny. And yes, it is possible she may lunge or growl at you if you try to clean it up. Then I would say for sure to leave it there a bit longer. I do have a question though, is she nesting in it at all? Has she displayed anymore nesting or “false pregnancy” behavior? I’m not sure how much info you’ve been given but here is some reading on it if you are interested, it’s an answer that Dana Krempels provided a user. Dana Krempels, if you are not familiar with her is a super-wonderful bunny savvy person with a PhD- but please know that she is not a vet however is very reliable to many bunny-savvy people and can get answers to the most puzzling questions that even the wonderful people here can’t always answer. 
http://en.allexperts.com/q/Rabbits-…gnancy.htm