The forgetfulness of a female imam in prayer with a single prostration

The questioner:
He says: Honorable Shaykh, may Allah grant you success. A group of women prayed in congregation, and their imam forgot, so she prostrated once and sat for the tashahhud, and no one alerted her during the prayer. They want the answer now: do they repeat their prayer or not?

The Shaykh:
What?

The questioner:
A group of women prayed in congregation.

The Shaykh:
Yes.

The questioner:
And their imam forgot, so she prostrated once, and sat for one prostration

The Shaykh:
from the prostration of the prayer or from the prostration for forgetfulness? Yes. If it was from the prostration of the prayer, the prayer must be repeated because she left a pillar and the interval was long, so the prayer must be repeated. But if it was one prostration for forgetfulness, the prostration for forgetfulness is dropped if the interval is long. Their prayer is valid. Yes. Who? Yes.