If Angela has a court date on July 24, I wonder if there's any chance we'll know if the human hair was Elaina's prior to that date? I suspect even if the DNA results come back sooner they'd hold them close to the vest and unveil them at her hearing (or eventual trial) if it ends up positive as being Elaina's.
I reckon you may be onto something there if the hair is elainas I believe they may use it as a noose for AS to hang herself with in court or maybe they're using it on her now, in hopes of a confession?