With all these movies, it leaves one to wonder where Spider-Woman could fit into it all. [The Avengers: Age Of Ultron](movie:293035) can take care of that. Quite simply actually. It's not as cramped as all our speculation for heroes in this movie goes.
I have two different scenarios can get her into this movie.
Don't forget that she was both a HYDRA agent AND a S.H.I.E.L.D. agent. The comic is the comic and the movie is the movie. She could be purely a S.H.I.E.L.D. agent or a HYDRA one.
So my first idea is this:
The team storms a HYDRA compound at some point in the movie.
Set photos and other footage low quality footage put [Black Widow](movie:1070824), Captain America and Thor there too. The whole team is at this icy fortress. So they could go there and find a pod busted open. Titled "Project Arachne: Failed. Status: Escaped. Name: Jessica Drew". Fans would go BANANAS if that was in the movie!
My second idea:
She retains her S.H.I.E.L.D. status as The Spider. If she was a S.H.I.E.L.D. agent, then Captain America, Black Widow and Hawkeye would know her or know of her. Say she's one of the operatives that Fury wanted on his team when he said he's going to Europe at the end of Cap 2. He does have a minor role in Avengers 2. He'll see them all at some point. Fans would go nuts if they heard this, but the general audience wouldn't know. If fans heard Fury say "The Spider is critical, I gotta go." that would be bonkers. I'll put it in this context. Cap, Widow and Hawkeye would know that The Spider is Jessica Drew. The general audience would be Hulk, Thor and Iron Man. The Spider could be a base, or a project for all they know.
Both scenarios indicate that she has, or is on the verge of getting her powers.
You don't need huge scenes to bring in characters. Just like I said with White Fox, something simple could do it. Just like these ideas.
Marvel Studios doesn't want slutty hot heroines for their MCU. If they even want Spider-Woman, they are more than capable of making her costume look badass. If she is in the MCU, I feel like she has the potential to be taken more seriously as an Avenger.