Cijepljena sam is “I am vaccinated” in the female form. The only difference to the previous video is one extra syllable.
The story stays almost the same: the same parrot going “cheep”, the same ducks in a line, the same seeds – except this time the ducks are standing very close together. That detail is what tells you the female ending.
Every other pair in this chapter works the same way: the same image with one changed detail for the ending.