I think the only Avenger that will give her trouble is Vison. I might even say Cap might have a chance because he's the best combatant/strategist, but even that's a really big stretch.
Avengers who rely more on weapons/tech are not gonna beat her. It's safe to say that from what is shown in the film she can bend/alter inanimate objects to her will. I don't see a reason why she can't alter weapons the same way she alters
buildings and other matter. She could just fold Iron Man's suit into a tiny origami of Pikachu.
Hawkeye, Falcon, Iron Man and War Machine are out.
Avengers who rely on fighting skills are not gonna beat her with just that. She was soloing Kaecilius and all his zealots until they fled from her. The only person I see having a chance beating her in melee is Cap and even than she'd still have an edge because of sorcery.
Black Widow and Captain America are out.
Which leaves Hulk, Scarlet Witch, Vision and Thor.
Hulk is gonna blindly jump at her so all she has to do is open a portal right in front of her and BFR him anywhere she wants.
Wanda is powerful but she's only a kid and getting used to her powers. Wanda is essentially a spell caster as well she's not gonna beat the Ancient One at her own game. I can see how someone would rebuttle this though.
Thor will be tough but he's not the smartest Avenger. She can't fight him so she's gonna have to BFR him somehow.
Finally Vision. He's the wild card because he has an Infinity Stone and falls into a strange category. Will she be able to manipulate his cells? He IS synthetic. That is why I think of all the Avengers he will probably be the biggest problem.