Did she prostrate once or twice? What is the ruling?

Question:
Umm Muhammad from the Jizan region, Sabiya district, sent two questions. Her first question says: I prayed the 'Asr prayer, and when I prostrated, I did not know whether I had prostrated once or twice. I completed the prayer with the prostration for forgetfulness, without prostrating another time despite my doubt. Is my prayer valid? Or is it invalid?

Answer:
It is obligatory for one who doubts whether he prostrated the second time to prostrate the second time. This is the obligation: to prostrate the second time, then to prostrate for forgetfulness after that. As for this woman who doubted about the second prostration and did not prostrate it, she must repeat the prayer. She has to repeat the prayer because she left a certain pillar while in doubt. Therefore, the two prostrations are necessary. It is obligatory for her, if she doubts, to perform the second prostration and to prostrate for forgetfulness before she says the closing salam. She combines both matters: she performs the prostration until she is certain that she prostrated twice, and with that, she prostrates for forgetfulness because of the doubt. This is what is obligatory for her, and it is not permissible for her to be lenient in this matter.
Unless she has intrusive thoughts; the original state is soundness. If she has intrusive thoughts, she owes nothing. But if not, if it is an occasional lapse, it is obligatory for her to prostrate the second prostration, then to prostrate for forgetfulness. As for one who is afflicted with many intrusive thoughts, he must discard them and build upon his assumption, and it does not harm him. Yes.

The presenter: May Allah reward you.