Why is a two year old setting her own boundaries? If you ASK a child to be good, why would they, it's much more fun to be naughty. When are you and your husband going to act like parents and lay down some rules? YOU tell her how you want her to behave, what the new rules are along the lines of - You do not speak like that to mummy and daddy, you listen when we tell you to do something, you do not use bad words etc. Tell her she will get one warning if she breaks any of the rules and if she does the bad behaviour again, she will have to sit on the naughty chair/stool/stair/mat etc. for 2 minutes. That way she will learn that bad behaviour means sitting on her own and not getting any attention from mummy and daddy. To counteract this you could have a reward system going so that good behaviour, helping you, picking up her toys, whatever you think appropriate for her age, gets a star, a flower whatever you think of and then when she's earned, say 10, then she gets a new toy or treat. Hopefully she will want to get rewards and you will see more of her good behaviour.
The thing is if you don't nip her bad behaviour in the bud now and get her respect, what will you do when she becomes a teenager. You'll have no chance.