I have always wonder about this, but had Jenna ever herself said why she kinda just stop doing cosplay in a more dedicated way? She still go to comicon in cosplay, and even stream in cosplay (even though the most recent one was that Spider-Gwen stream months back), but doesnt release cosplay set or anything any more.
I think once I asked her about this while she stream, and her reply was something like "Uh, no, I don't cosplay anymore, that is nerd shit", but she said it in a playful joking matter, so I am not sure if it is sarcasm, or "I mean it but in a joking manner".