It takes more than "several times".
New birds should be housed side by side with the existing birds, separated by wire, for at least a couple weeks.
Sometimes it takes longer.
Do you have any other chickens...or is this someone else's coop and 2 hens?
You can't just put a bird in with other birds without some kind of introduction period.
This might help:
https://www.backyardchickens.com/articles/introducing-a-single-hen-to-an-existing-flock.71997/
As might this...