Unfortunately developing an attitude is the age! With the swearing I would probably say that its not really acceptable and that there are other ways of communicating her frustration. My dd has turned 13 this year and really goes up and down. For us it is a give and take situation, so we use privledges as rewards and they are taken away as well. For rude behaviour, Jess will often find herself grounded or her mobile phone taken away...as you can appreciate with your dd these can be huge things as their friends mean everything at this age! I hope it gets better for you...

Jo