Screwing and unscrewing bottle caps?!

At what age do they normally do this?

My LO usually pretends to drink from a soda bottle, but we always leave the cap on.

Cue to yesterday, I gave her a small water bottle with the cap on, and I turned around for like 10 seconds and there she is, drinking water.

Ok, I must have not screwed it properly, but then today I was drinking some yoghurt and she comes, takes the cap off the table and nonchalantly screws it back on my yoghurt bottle.

I tried to search online, but didn't really find any info and I am getting worried she'll figure out how to undo the baby locks which seem to me much easier to fiddle with than a bottle cap.

Any advice is appreciated!

Thank you!