She might get more attention if Gin did end up in Hell, but that depends on whether or not she is someone Kubo wants to focus on.
If anything could be said to be one of Kubo's weaknesses as a writer, it is that he doesn't seem to know what to do with many characters once their original arcs are done. It is like how the Visoreds were mainly relegated to secondary characters after the Arrancar Saga was done. We see the Bankais of Shinji, Rose, and Kensei in TYBW, but it was one of those one-and-done situations I've mentioned elsewhere.
Or look at how Hisagi was treated in TYBW despite going through Bankai training with Kensei and Mashiro. It was Narita who had to pick up the thread of Hisagi's character in Can't Fear Your Own World.
The more I consider, the more it makes me cynical about the Human cast (Mizuiro, Keigo, and Tatsuki) going forward. The "arc" involving them could be summed up as gradually learning about the secret world Ichigo and the Nakama are part of, and that was mainly resolved through the time-skip. After that, aside from Tsukishima using them as pawns with "Book of the End", and Kyoraku giving them Soul Tickets because Ichigo might not be able to return to the Living World, their presence in the story is minimal, just to remind us that they're there.
To give a shorter answer, Kubo isn't good at dealing with a large cast of characters. He has specific characters he likes to focus on and develop more than others, and it comes at the detriment of the rest. I would even say this afflicts the members of the main cast, Ichigo and Co.