So, given people are wondering about Mariner's career, we can infer a few things at this point. Lower Decks series 3 and 4 both take place in 2381, and The First Duty took place in 2368 so the "thirteen years before" card lines up correctly. If Mariner was a first year cadet then, she probably graduated from Academy in 2371 or 2372. We know she served on DS9 while Worf was there, so she was there for at least some of 2372-2375. It's likely her first assignment out of Academy was either DS9 itself or one of the ships assigned to its defense. We also know she served on the Atlantis, the Quito was her last assignment before being transferred to the Cerritos in 2380, and she served on five ships before ending up there, so there are two or even three other ships she was on in that timeframe. Presumably one of these was the Oberth she "crashed".
Sito Jaxa died in 2370, so presumably this shook her while still at Academy, and was the root cause of her behavioural issues after she graduated.
We also know that if Amina Ramsay was recently promoted to Captain before her temporary assignment to the Cerritos it took her about 9 years to climb the ranks. By comparison it took Jim Kirk 11 years from graduation to promotion to Captain and assignment to the Enterprise.
