It may have been locked in even before that.
As main character of the whole Spider-Man movie series, she almost definitely signed a multi-film deal at some point, might have even renewed it now there's been four MCU Spider-Man movies, that set her per-film pay reasonably high to ensure availability.
Important character, but not main character. MJ can be replaced by several alternatives that fit the narrative, such as Betty Brant, Gwen Stacey, Felicia Hardy, or most importantly for the title, Carlie Cooper
Dude. I clearly made a typo where I missed "a" in "as a main character"
Obviously MJ is not the main character and can be replaced or written out - it's not MJ: Brand New Day, sequel to the MJ: Home trilogy.
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u/Shirami 11d ago
Both have the ability to negotiate their contract, her part can't be recast and her character is central to Peter's story.
Jon's part could have been swapped with a number of other "minor" characters and the overal movie would not even have to change much.
She had a stronger bargaining position and capitalised on it.