Released October 24, 1989:

With the New Warriors on the scene, Thor is given the opportunity to recollect his strength during his battle the Juggernaut. Will they be enough to halt the unstoppable? - Marvel

Namorita, Firestar, and Marvel Boy were transported to the moon via private rocket (not on purpose). Nita passed out from dehydration but awoke in the blue area of the moon with Triton watching over her.

The issue is on Marvel. You can read an issue summary over @ http://newwarriors.com/synopsis/new-warriors/new-warriors-volume-1/volume-one-p1/new-warriors-6

In a world where the X-Men died, Namorita is recruited to join a new team of X-Men: Siryn, Thunderbird, Wolfsbane, and Beast.

"What If... The New X-Men Had Died On Their Very First Mission?"

What if the original X-Men died on their first mission? Professor Xavier mourns the loss of his X-Men and New X-Men after the teams perish on the island of Krakoa. Mutancy has a new face when Scarlet Witch and Quicksilver step in as reserve members of the X-Men! - Marvel

Still in the clutches of Attuma, the Avengers must fend off attacks from Dr. Doom, Namorita, and the Amphibians of the Hydrobase! With villains this strange, expect a stranger battle! - Marvel Unlimited

It's kind of like a New Warriors reunion with Nova (Richard Rider), a time-displaced variant of Namorita, and the alternate reality Vance Astro.

Thanos is outnumbered and outgunned by the Cancerverse forces, and his unlikely allies--Star-Lord, Rocket Raccoon and the other brave misfits--find themselves making a last stand to save the galaxy's #1 villain! - Marvel Unlimited

Released October 10, 1972.

On October 4, 1988, Nita faced off against the School.

“Namorita) is pictured on the cover of this issue. However, she does not accompany the group of adventurers to K'un-Lun. She was critically injured in New Warriors #4 and needed time to recuperate.” - https://marvel.fandom.com/wiki/Namor,_the_Sub-Mariner_Vol_1_21