Lmao, that's not how that works. The director would have final say in what works or looks best not to mention the showrunner and producer. And would also work with the editor in post long after the actor is gone to use whatever version they felt best (hailee's action or the double). To make up the claim the fights were bad solely because Hailee wanted to do them herself and then go on a big spewl about your said made up speculation is many levels of ignorance. It's hilarious you think Hailee had any sway in what stays in or out of the final edit, not to mention that she had any power to decide what looked best on the day. Hailee would "overrule" the director on using her fight sequence and that they keep it in? Top kek. No the actual logical answer is that the problem would lie with either the stunt coordinator, whoever shot it, and likely whoever edited it, with the director also to blame for not recognizing what wasn't working. All much more likely scenarios than your ..Hailee ruling the set with some iron fist, deciding what stunts she will be doing and how it's coming along in post and what they go with in the end. Lmao no.
These productions are well oiled machines at this point. The actors aren't running a damn thing when it comes to stunts. Hailee likely came in and did whatever the hell she was told and kept it moving. No more no less. Did they shoot a version with her doing the most she could? Maybe, sure. Did they shoot it with a double as well? You can bet your bottom dollar. What take they used and everything after has nothing to do with Hailee and the fault would likely lie in many places away from her. If it looks bad, to say it's literally just the actors fault because that's how they liked it is ...well not smart lol. They didn't want to bruise Hailee's ego so they didn't shoot any additional scenes with a double, twiddled their thumbs and moved on? Marvel studios production? Lol. They likely had multiple takes from Hailee and doubles and the fault from the jump was that it was poorly directed, coordinated, shot, and edited...long after she was gone.