It can be a struggle....and it seems your little girl have "strong opinions" or will.
Since she have this strong will is it mandatory for you to show a firm but loving attitude towards her.
If you have determent that she shall do a task....then you must see it true....if she put up a "fight" and win...she will learn that go against you are fine....and since they have a lot more energy then yourself...they will start to control you instead of you controlling her
With the potty thing.....try to play with her....try to let her sit on it also in times when she not need it.....talk calm to her....give her a lot of "kudos" .
Try to follow her behaviour...often they put theme-self into a corner...or stop up with a "dreamy" view in their face..when the time comes for deliver...fetch her and put her on the pot.
Talk calm to her....since she is strong will you will have to "suffer" a bit in the start....but if you start to win this will benefit you in your next struggle.
If you are a couple it is most important that both of you always threat her the same way.
Many times we like to give in...in order to be good to her...or to lessen a "howling" situation...if we do...she learn that "howling is good" and will use it for what it is worth
The most important thing though, is to do everything with "Love".. and not take any written statement as "the only truth" in how to deal with it, because we are all different and we must evaluate the situation each time......what I think is true though....that is that it will be a competition between you and your daughter, on who has the strongest will and who shall control who....make sure you win that contest
