Maybe you have to accept the chick was not strong enough to hatch. The mamma did leave the nest, she gave up trying.
If you want to persist in trying?… You can put it under the other hen and see what happens. If the chick hatches, is alive and kicking there are 2 options:

If you want to persist in trying?… You can put it under the other hen and see what happens. If the chick hatches, is alive and kicking there are 2 options:
- Put the chick back under the new mamma in the night if it can walk around with the other chick. Look early morning at sunrise if the chick is accepted.
- Leave the chick with the new mama and throw the eggs of the second mamma away in s few days if you are sure the chick survives.
