It has been a busy time for Croot, who has also starred in Netflix’s Sacrifice, a satirical action-comedy film with Anya Taylor-Joy, Chris Evans and Salma Hayek.
She plays another “violent”, “dark role” and had to learn how to load and reload an AK-47 assault rifle without looking.
She said: “I’d never held a gun before. I’d never actually seen a gun in the real world. I had to really quickly become a pro.”
Croot also stars in the horror The Rabbit Trap opposite Oscar-nominee Dev Patel.
The Rabbit Trap, which was filmed in Yorkshire instead of Wales, because of the no-smoking rule on sets in Wales, tells the story of a couple who move from London and encounter fairies from Welsh folklore, known as Tylwydd Teg.
Croot plays The Child, and was able to keep her native Merthyr accent while in character.
When asked if she hopes her next role might be more gentle or have less mud, Croot laughed, saying: “No, bring on all the mud, all the ash, all the guns, all the fights.”