It seems like it from the trailer, but I'm nervous about the voice actress, she does sound different than 3.... But I'm willing to give her a fair chance
From the trailer, its clear that its ~15-20 year time skip, she is able to drink witcher potions so she passed the trial of grasses, and clearly has much more control of her powers.
The trial of grasses point is where im concerned, yes she would have plot armor for a procedure that has a notriously low survival rate, plus the school of the wolf (Geralt, Vesimier and co.) destroied their old records after the events of the first game so that noone could produce more witchers.