[Bammabits]

I love my little Maya who is now 5 months old. Her personality seems to be changing and she is becoming very willfull!! WE have been to one session of 'Manners' classes and she did really well. I have noticed though, that she focuses on the treat and not the behaviour. She will do whatever we are asking because the treat is there. She will not do the behaviours without the treat. Prime examples are 'Come' and 'Leave it'. She will 'leave it' with toys and things she doesn't really want. Today I found myself chasing her around the house trying to get a package of sesame snaps she had made off with. Yesterday it was my underpants! She was being entirely feral. I caught her yesterday and she had such a firm grip on the panties that I could lift her completely off the ground. I had to pry her jaws open, praying that she wouldn't turn demon and bite me. She will growl and snap at us as well, sometimes...
I have now put her in her crate (Jail) until I calm down from the latest incident - what am I doing wrong? Where did my little sweetie go?