Credence's Aunt

She is solely mentioned to be Credence's aunt in the screenplay.

SCENE 109
EXT. LIFEBOAT—1901—NIGHT

CHILD LETA, IRMA, and BABY CREDENCE are in one boat, CREDENCE’S AUNT and BABY CORVUS in another.

_{Fantastic Beats: The Crimes of Grindelwald - The Official Screenplay}

Considering that Credence is said to be Albus' brother it is highly likely she is also Dumbledore's aunt.

SCENE 120
INT. NURMENGARD CASTLE—DAWN

GRINDELWALD
You have suffered the most heinous of betrayals, most purposely bestowed upon you by your own blood. Your own flesh and blood. And just as he has celebrated your torment, your brother seeks to destroy you.

[...]

GRINDELWALD
It is your birthright, my boy. As is the name I now restore to you.
(whispers)
Aurelius. Aurelius Dumbledore.

_{Fantastic Beats: The Crimes of Grindelwald - The Official Screenplay}

Of course the Dumbledore known family tree isn't exactly extensive but we do know of an aunt of Albus' called Honoria so it could be her (quote taken from Pottermore).

Though somewhat dated, the expression ‘to have a hairy heart’ has passed into everyday wizarding language to describe a cold or unfeeling witch or wizard. My maiden aunt, Honoria, always alleged that she called off her engagement to a wizard in the Improper Use of Magic Office because she discovered in time that ‘he had a hairy heart’. (It was rumoured, however, that she actually discovered him in the act of fondling some Horklumps, which she found deeply shocking.)

_{The Tales of Beedle the Bard, Chapter 7, "Albus Dumbledore on 'The Warlock’s Hairy Heart'"}