What is the ruling for one who forgets to recite the middle tashahhud? Does she recite it in the third rak'ah, or does she perform the prostration for forgetfulness, and is that sufficient?

Question:
May Allah reward you with good. The questioner says: When I pray, and I am in the second rak'ah of the prayer, I do not recite the first tashahhud. I sit, then I stand up while I am forgetful, then I pray the third rak'ah and I remember that I did not recite the first tashahhud. So, do I recite it in the third rak'ah, or after I finish the prayer before the taslim, or do I perform the prostration for forgetfulness and then say the taslim, and is that sufficient for me?

Answer:
If one forgets the first tashahhud and stands up from it, then if he remembers before rising from the bowing, it is obligatory for him to go back and perform the first tashahhud. If he does not remember until he has fully stood up, it is disliked for him to go back, and he continues. Or if he has begun the recitation, it is forbidden for him to go back, and he continues in his prayer. Then, when he wants to say the taslim, he prostrates two prostrations for forgetfulness, and they suffice, with the praise of Allah, for the first tashahhud; they make up for it. Yes.