What ws Mumm-Rana doing all of this time

"thezaxfactor, post: 124386, member: 362" said:

The fact that Mumm-Ra knows about her but she doesn't know about him to me suggests that he subdued her long ago, wiped her memory and magically forced her to lay low. Why would she sit idle all that time, when Mumm-Ra professes to exert his evil control over the whole planet (or half the planet in the days of Zaxx), unless she were somehow hamstrung? She is, by all appearances, Mumm-Ra's equal, his Good counterpart. Something must have happened to her.

Perhaps she was tricking Mumm-ra. I've been playing with the idea that Mumm-rana is more than we think she is and that she's fooled them all for a long time.

As long as evil exists Mumm-Ra lives!
Mumm-Ra's first dialogue in The Unholy Alliance was "Enter" when the pyramid door opened to the Mutants, who were crash landed by Mumm-Ra's pyramid.

Mumm-Ra's historic appearances
Episode 128 The Zaxx Factor - Mumm-Ra defeated Zaxx and took his medallion which was hidden behind his sarcophagus chamber.
Episode 33 Dimenson Doom - Mumm-Ra defeated Wizz-Ra and was banished by the Sphinx.
Episode 22 The Astral World - Brodo, a powerful magician on 3rd Earth when his magic threatened evil Mumm-Ra which Mumm-Ra banished Brodo to the Nether World.
There's more to think, please help me guys out