I have a theory that Maiden is the as of yet unknown member of Zooganic. To be fair, I haven’t read the manga so what I say can be easily disproven, but I still think she might be. Firstly, all the members of Zooganic each have an animal themed Beyblade, and so far, Maiden is the only Blader as of yet who has an animal-themed Beyblade (Technically, X Kurosu has an animals themed Beyblade, but, he’s already a part of Persona), Shark Edge. Lastly, most of the teams each have one female Blader (Pendragon has an unarmed one with purple hair and Persona has Multi Nanairo), and Maiden has enough experience due to being a former pro Blader to be on a competitive team.

As far as I understand, beyblade themes have nothing to do with teams. Because Kadovar the owner of Wyvern Gale and Burn Fujitaro owner of the Phoenix Wing although they share the myhtical creatures themethey are not in same team too.