Is she confirmed for Captain America 3: Civil War?

That's the only source I've seen saying she'll be part of Cap 3, so I'd say that right now, it's just speculation.

But now that Revenge has been cancelled, there's a chance that even if she isn't in Cap 3 (and I still have hope of that happening), that she can be on Agents of SHIELD or its spinoff.

links not working.

Yes. It's official. She's back!

Yup. She just confirmed it in an EW interview.

let's hope she gets a bigger role and a fight scene!

It's been confirmed by Marvel's press release that EVC will be back as Sharon Carter/Agent 13, and EVC said in an interview somewhere that she starts filming next week!

She looks like she could handle herself in TWS when she points the gun at Brock Rumlow and he pushes her but she rolls underneath the desk and up the other side.