Several online sources list Timeslip as a member of Captain America's resistance team during the Civil War, but I don't remember her being one of them. I think this is just incorrect information that is getting repeated. Am I wrong? I didn't read all of the tie-ins.
I know the team wasn't official, but some of those Civil War Secret Avengers characters are better Avengers candidates that folks who have recently joined, particularly Cloak, Dagger, and Diamondback.
She's shown in She-Hulk #8, a tie-in. However, it's ambiguous if she was definitely part of the resistance. She was just shown being attacked by an anti-superhero mob in LA. The main story was that someone released the names of the original New Warriors on the Internet.