It takes a lot of repetition and consistency before they start to learn your rules etc. At this age, I see it as the time when you are laying the groundwork so that in the next few months they will come to know what they can and can't get away with and what the rules are. It is also an age of a lot of physical redirection along with your words (ex. saying "no toys in the mouth" and then physically removing the toy if they do not do it themselves). With tons of repetition and consistency, they do get it...but it takes time and patience. Sounds like you are on the right track! Also, one thing is to remove tempations where possible. For example, if you know she is going to be constantly getting into something, I would just move it to where she can't get it and that removes the power struggle. Avoiding problems is sometimes a good place to start. Good luck!