Mara is a character from the old EU which Disney discarded.
So was Thrawn, and he came back.
There's also several other, albeit minor characters, from the EU that have been reintroduced in the books since the wipe in 2014.
https://starwarsfans.fandom.com/wiki/List_of_Legends_characters_reintroduced_in_Canon
https://aminoapps.com/c/star-wars/p...t-is-now-canon/QJFX_ulQ5kN7ZBYQp6pZeYBR2xrMEw
Writers working in the new canon are not forbidden from brining back EU characters.
I agree that Mara probably would't work as well as Thrawn.
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