Argentine beat Mexico, who also X-ed with Poland, so only 1 point. They can beat Saudis. That would give them 4 points, which will equal Poland if they lose to Argentine, which they probably will, but not 100% considering Argies got beaten by Saudis.
So I'm guessing:
Argentine 6
Mexico 4
Polan 4
Saudi 3
Goals will decide, won't they?
But Polan only needs 1 point to secure her place, then:
Polan 5
Argentine 4
And doesn't matter if Saudi 6 or Mexico 4, Polan is in the knockout.