It's even worse than that. According to the article, she saw him do it:
After a 45-minute conversation, the Bordens told Ludwig he could no longer see their daughter. They also told him to tell his parents about his relationship with Borden, Totaro said. Ludwig told police he sat for five to 10 minutes, staring into space, and “thinking in his own mind what he should do.” He looked at Borden for confirmation of what he should do, but did not get any. At that point, Ludwig told police he made up his mind and stood up and shot Michael Borden. Borden’s 15-year-old sister, Katelyn, who was nearby, fled into a bathroom, and Borden ran out the back door, across her backyard and onto Owl Hill Road. Ludwig then killed Cathryn Borden.
I'll never pretend I understand what goes on in some homes. Surely, none were ever perfect, but I've seen more than I'd like of messed up families...and this in the suburbs of a city.
While I have read that Michael Borden was a no-nonsence dad, leaning toward perfectionism (and his wife also), that doesn't fit with a photo of Kara portraying herself to be well beyond 14 years old. Is this facade taken for granted today? Why did her parents allow this?
Kara, I believe, was thrilled that an older fellow found her attractive. I'll guess many 14 year old girls would get an ego-boost from that.
I can't find her guilt-free in these murders. Somehow, some way, she is an accomplice. If I'm right on that, I have to hope it is discovered. She behaved despicably.