seahammer
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I think Misty Knight fits better than any of the other possibilities.
It explains why they would be somewhat secretive about her role, since she'd appear in all four shows and could possibly serve as the bridge between not only the four Netflix shows, but to the broader MCU as well. Think bionic arm supplied by Stark Industries. After all, she has much more history with Iron Fist (especially) and Luke Cage than Daredevil.
Warning... fan-fic ensues.
Misty Knight's an honest policewoman in a city where the Kingpin has his hooks into the majority of the police force via bribes, blackmail, intimidation and sexual favors. To this end, Ms. Knight supplies young, idealistic defense attorney Matt Murdock information about the framing of certain clients that he is representing. Information that would go against the city's prosecution, and therefore against the Kingpin's interests.
When this starts to become a problem, the corrupt cops are tasked with learning the identity of the leak, and fixing the problem forever. A scenario involving a burning ammunition factory is orchestrated, and Misty goes in alone.
She's not killed, but loses an arm. Murdock reaches out to an old acquaintance of his, namely one Mr. World Famous Armored Avenger. I'm not hoping for a cameo, but even a voice actor playing Tony Stark on the other side of a telephone line would more suffice. Tony says that he'll do what he can and will have his people get in touch with Matt.
Misty's now recovering, getting used to her robotic arm, but she's also disillusioned with the police force. She knows that she was set up, but cannot prove it, and thus feels like she has no choice other than to quit the force.
That would end her involvement in the Daredevil show, but her journey would continue into the Jessica Jones, Iron Fist and Luke Cage shows. By the time the Defenders rolls along, she's a full fledged superhero, joining forces with Daredevil, Cage, Iron Fist and Jessica Jones to take down Kingpin's most fiendish scheme yet, thus bringing things a full circle.

I'd be more than okay with something along these lines.