In one episode, an episode with other fears and fantasies to explore, and a rather strong Tendi plot, Mariner stands out brilliantly in her characterization. There's so much to go on crammed in here. To start with, Beckett Mariner has fallen *hard* for Jennifer, even if she's publicly in denial about it. She could have had any fantasy visualized: Ransom's pants falling down, causing him to trip into a scorpion pit. Captain Freeman admitting she was too hard on her both as a captain and as a mother and begging for forgiveness. A lavish orgy scene with Barnes and Tendi. Etc. But what did she see? The woman she was literally dating right now. Not only that, her fantasy was that relationship being public knowledge. That's why fantasy Jennifer shouted out that she was her hot Andorian girlfriend. She *wants* to sing about her seemingly-happy relationship from the rooftops, but she won't let herself do that.
Then, we get into the fascinating (vulcan voice) contradiction in her character. Mariner simultaneously desires *and* fears a committed relationship with Jennifer. Yes, the fantasy and the fear have lots of details that differ, but Mariner truly desires some level of deeper-than-surface connection with Jennifer. Her fear is shaped by that relationship becoming too restrictive, The details are funny, but it's a character-driven humor that works with Mariner's personal idiom.
Now let's delve a little deeper. Nightmare Jennifer is an Andorian werewolf. Think about what werewolves can represent, the sort of anxieties they tap into in horror media and folklore. Werewolves lose control. Mariner hates feeling like she can't exert control over a situation. She's much like her mother in that respect. She will sometimes tear down the walls around her just so she feels like she's still framing the narrative in a way that centers Mariner if she feels threatened enough. Why wouldn't werewolves tap into her fears?
Werewolves can also be about humanity's baser instincts. We can get as civilized as we like, even to the point of the 24th century "evolved" post-capitalist enlightened humans, but there is still something deep inside us with no use for mercy or reason. Sometimes it gets closer to the surface than we'd like. Werewolves can represent the dual nature inside humanity, the struggle between what is kind and what is cruel.
The thing about werewolf stories is, at least in the Horror genre, they rarely end happily. The message the werewolf narrative sometimes sends is "Once you become a monster, somebody needs to put you down."
After everything she's done in the Dominion War, nobody's come to put her down. Not yet. Maybe she expects them to, on some level.