I was a little hesitant when i had to choose between older and Yellow Heart. Normal Peashy has blue eyes, and this one has yellow eyes, but this is actually a coloring made by another person, not the artist. But then i reached the conclusion that even then she still has dem yellow eyes, therefore Yellow Heart it is.
I guess she made some "modifications" to her HDD mode to use it as default instead of "little child forever" mode. Obviously she can't use a form that is bigger than XBOX HUEG as default, although i would love to see Vert's reaction to that.
more derivative work, sorry for the low quality of the image (it was the closest evidence I could find) but this is based on a page from a neptunia manga: http://i.imgur.com/XKK9d6V.jpg
Actually, from what I could gather, the original comic that this coloring is based off of states that this is supposed to be a teen version of Peashy, not some alternate HDD design. I adjusted the tags accordingly.
Whether or not they actually considered making Peashy a teen instead of a child in-game is questionable. The Victory storyline definitely would have gone differently if she became a CPU as a teenager. Her relationship with the other characters (especially Vert) would surely be different. Maybe we would even get to see adult IF and Compa.