To jest kobieta
This is the only phrase which I would use.
However, you can only use in certain sense. Like when pointing at a picture of someone who has an undistinguishable sex. You could say something like, "Thats a woman" To jest kobieta.
Ta jest kobietą
Very crude sounding. Ta is an impolite way of referring to a female.
More likely heard as Ta, to jest kobietą!
Like in an all male discussion about an attractive woman, "That one, shes a woman!"