Oh, I so know what you mean when you speak of taking a cake problem to bed with you! It seems when I am in the middle of a cake, I awake in the middle of the night, often with the solution.
I went to bed last night with your Aaaaaaargh ringing in my ears. I almost got up to type this letter to you. First of all, take a look at this link.
Here are many tutorials that may help. I was looking for a particular tute to send you, one where she makes a Christmas elf and shows how to make a skirt like I was earlier trying to describe. Apparently it was only a limited, seasonal one for it has since been deleted. I am thinking that the one here where she makes a pregnant woman (no reflexion on your sweet little daughter ! ) just might be of help to you for her general principle of doing skirts.
This was how I made my elf with her skirt. (I know, her face is scary and she is too booby. She was one of my firsts.) I construct my figures on top of a block of styrofoam, placing the legs first--whether hanging or bent, or as yours--tucked to the side. Then I insert a wooden skewer into the styro where the remainder of the body will be. Slide the ball of fondant for the buttocks/abdomen over the skewer, first moistening with gum glue. Cut the circle for the skirt and slide that down, arranging it over the lower body. Construct the torso, sort of a wedge shape, in proportion to the parts already assembled. Use the same color as the skirt so when you are finished it will look like a dress. Then you won't have to separately "clothe" the torso. The top portion will become the shoulders, so take a ball tool and made a depression on each side where the arms will be attached. Put the arms on, first moistening with gum glue, and then a small ball, rolled to a small cylinder, for the neck. Cut the skewer to the proper size to allow the neck and head to be placed. I like to wait for the body to firm up a day before placing the head, and during that time the head, which I made from fondant/tylose, has time to firm up also.
Apply the hair and whatever and she should be ready to place on the cake or board next to the cake.
Like I said, it looks like you have already completed so much of your figure, so this might be redundant. It might not even apply to your situation. This is just what I do and once you've done it you can modify the technique to any of your figures. I made my blue fairy kneeling and the green fairy reclining after making the first elf who had her legs hanging over the side.
Here is my scary, booby Christmas elf!
<a href="http://cakecentral.com/g/i/2870314/christmas/u/700117/flat/1/"><img src="http://cakecentral.com/image/id/5496794/width/400/flags/LL"></a>
I know that you already have made several of the parts, but could part of your difficulty be the medium you're working with? Liz's recipe for her fondant, (found on the same site, scroll further down), is my go-to now for figure making. I prefer MFF for general cake covering, but this LMF I love for sculpting.
I really think that with your figure sitting, as you describe, it should work like her video shows. Just don't make a baby bump!
Good luck and I hope you have a sound night's sleep tonight!