The only way
she can be pleased is if the Doozers are able to build without their towers getting eaten. It's them she's concerned about, not herself. The lesson she learns in #6 confirms it: "It's not easy to understand someone's problems, but it's very easy to think you do." (Plus, in
The Great Radish Famine, it's all of Fragglekind she's concerned about when she rounds up the Doozers to help her with the Trash Heap's plan.) But you've got a good point. I'll explain ...
To me, Mokey is a true Piscean. She's artistic, compassionate (especially to Boober
) and sometimes irritated when things don't go her way. Her compassion gets the best of her in
New Trash Heap in Town (where the fame goes to her head) and
The Incredible Shrinking Mokey (where her "mother" instinct is overtaken by the crafty Begoony), but it also saves her from the wrath of Junior Gorg when she helps him in
Junior Sells the Farm and
The Great Radish Caper. The differences between her and Red become almost completely intolerable in
A Cave of One's Own, and her feelings of neglect lead to the urge bounce back in
Mokey's Funeral and
A Brush With Jealousy, in both of which the plans seem to backfire. Yet, there does seem to be a paradox between
The Finger of Light and
New Trash Heap in Town - in #12, Mokey can't handle being a leader, while she takes to the position quite well in #24.
Mokey may come off like she knows everything and is perfectly content, as the envious Red suspects in
I Want To Be You, but in actuality she, like all the other Fraggles, is always in the process of learning, and she's proud of herself in the end for what she's gained from the experience. Sounds like a Pisces to me.