My wife missed shekiah the first night by 15 minutes but she did the full bedikah. Is it counted or she needs go do it again?
It is not clear to me to which night you are referring. If you mean the hefsek tahara, then it is too late, and even according to those who are leineint, but not when it is so late, therefore she will have t do another hefsek tahara the next night.
However if you are referring to the second bedikah of the first day, then b’dieved if it wasn’t done, she is still alright and she can continue counting, and doing bedikas as if nothing happened.
Y:D 196-4, Chochmas Odom 117-12, Igros Moshe Y:D 2-79.