My Ballard has the story and the police report. Right now there are no suspects and the attack is not being investigated as a hate crime—which is completely outrageous:

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Just about two weeks ago, Tad and Cindy Anderson’s daughter, Tiva, was attacked with a baseball bat near the skate park at Ballard Commons Park the intersection of 28th Ave NW and NW 67th Street. She suffered a serious head injury, but Tiva is expected to make a full physical recovery. However, her parents say she’s emotionally fragile since the attack.

...

“We have learned through others that the woman who attacked her was also harassing her from dressing in female clothing, saying, ‘You should not be wearing those clothes’ (or words to that effect).”

The only thing the parents know is that the attacker is a white female, and they believe she may hang out around the skate park. “The female came up along side [of her] and told her, ‘I don’t want to see you around the skate bowl anymore,’” the police report states. “The female then struck [her] on the right side of the head with the baseball bat.”

The SPD tells My Ballard that the police aren't investigating this as a hate crime because the victim—who suffered a subdural hematoma, had part of her skull removed, and was "drifting in and out of sleep" while the police spoke to her—failed to tell the police during that one and only interview that she was attacked for being trans.

Anyone with any information is being asked to email the kid's parents and call the Seattle Police at (206) 625-5011 and reference case number 2011-273665.