She can refer to herself as a girl but at the end of the day she still was born with a dick and isn't going to get a sex change, so her pronouns do not represent her literal self nor the tags that define the image. They will be factual to what the character LITERALLY is, otherwise anyone who isn't keeping up with guilty gear lore or memes wouldn't ever have known nor guessed that the character is trans and that'd be misinformation.
Make a "trans" tag if you really want her pronouns to be known to the tagging community, but nobody actually cares otherwise, nor does Bridget care what people call her anymore.