Yeah, coulda made it clearer I don't think she actually has a tragic backstory.
Like Claire in QC, she's supposed to be inherently pitiable simply because she's trans, even if almost everyone in her life is portrayed as treating her with kindness and understanding.
Parents are supportive and understanding, unlike with many real trans children.
Parents are incredibly wealthy and make her the toys she cannot find (this is supposed to make us feel bad for her), unlike many children trans OR cis.
School is accommodating, unlike with some real trans college students.
Nobody except the Designated Bad Guy ever brings up her status.
So basically we have a person whose own bio states she goes out of her way to be irritating, and we're supposed to feel bad for her because it's assumed as a given that the audience will associate being trans with a lifetime of tragedy.