Wasn't she the one who asked Morpheus to spare her sister? If she wanted to rule, why would she not allow to kill the Goddess then?
Yes, it is on my to do list to visit She-Who-Waits, too, but one meeting is not a substitute for the other.
Even if we do not succeed in gaining any useful intel concerning the situation in the south, there is always merit in knowing your enemy. What are her weaknesses, what are her strong points? Even our illiterate maul knows how important those are:
"Magic is not the only way to protect yourself," he begins, thinking back to the very first lessions Eris ever gave him, "Every single enemy you could ever encounter has a weakness. Every single enemy you could ever encounter can be beaten. That goes for men, for monsters, even for gods. Do you understand?"
Is she vain? Is she proud? Is she prone to fits of anger? Does she have a breast size complex? We know too little about her.
We ourselves have learned the importance of finding out about your enemies. In our very first fight with the Thin White Mage we chose to employ mental spells as it was our most practiced school of magic, and nearly paid for it with our lives because trying to appeal to his emotions and desires was futile. We did not make the same mistake twice after we learned what makes him tick - instead, we appealed to his pride and curiosity, and tried to trap him with a promise of our capture. Time will tell if it was effective or not.
There is another precedent that is a part of Myth lore. Connacht, the Great Hero of the Wind Age, who slew the previous Leveller and drove the Myrkridia to extinction, was later reincarnated as Balor and laid waste to the Empire of Cath Bruig. He kept many of the traits he had when he was human, though, and a passionate hatred for everything connected to the Myrkridia was one of them. Alric, knowing this, procured a battle standard of the beasts from the Tain where they were exiled, and during their final confrontation he taunted Balor about teaching him a lesson in humility, raising the standard. Enraged, Balor came to challenge Alric in person, whereupon he was trapped and immobilized with the help of the Eblis Stone, and then hacked to pieces by the remains of the Legion.
None of this could have happened, had Alric not exploited the quirks in his adversary's character.
Of course, this goes both ways. For every thing we learn about the Goddess, we reveal something about ourselves. But she has thousands of eyes and ears to spy for her. We only have our own. I find such a trade acceptable.
Knowledge is power.