No, almost certainly not.
But ISA brown are sex linked. Cockerels will be white with specks. Hens will be brown/red. Since yours is a cross, it's hard to say. Do you have a photo?
How long has your hen been sitting?
Does she have any chicks already?
There's a chance she will attack the chick, so go slow.
Don't put her under any later than 1-2 days old. They imprint in that time.