Zombie movie

I saw this movie several years ago and I spent months trying to find it but I cant. The plot goes like this. There is a virus that spreads throughout the humanity and there is a team of people that are trying to stop it. The zombies can smell people and they attack them but soon they found out that they are not attacking each others (zombies). There is also a group of children zombies there. It turns out that zombies are actually improved version of humans. At the end of the movie there is only one human person left. She is in some shelter behind some glass protection so the zombies cant smell her. They are sitting and she is teaching them.

The Girl With All The Gifts https://en.wikipedia.org/wiki/The_Gi...he_Gifts_(film)

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I can't believe it! I was looking for months for it! Thank you so much!

No probs