I am hoping this will not belong here but I will post it here to see if this sounds like something with a label or just behavioral.

DD#4 is such a moody little thing. She will scream at the top of her lungs at everyone and you can't get her to stop without her having a spack attack. SHe will be happy one second and completely nutso the next. When I talk to her I feel like I have to tread on eggshells for fear of setting her off. DP was saying this evening when she was having a screaming fit while DP was getting her out of the bath that he wants to take her to see "someone"... DD#1 thinks she is bipolar and I said that to one of my sisters after she had her for the day and she replied that maybe she has.

What do you think? She is very challenging, more so than any of the others.

TIA.