Dought & clear, - Is it prescribed to repeat al-Faatihah if a person did not focus properly when he recited it in prayer?.

There is a sister who recites al-Faatihah when she prays, then she
starts to recite whatever she can of Qur'aan, but sometimes, if she
realizes that she did not focus properly when she recited al-Faatihah,
she goes back and recites it again, then she recite whatever she can
of Qur'aan, and continues her prayer. Is this permissible?.
Praise be to Allaah.
It is not prescribed to repeat the recitation of al-Faatihah in one
rak'ah. If this sister failed to focus properly when reciting
al-Faatihah, then she realised, she should focus properly in what is
left of her prayer. If she does that, she will soon get used to paying
attention and continuing to focus properly, in sha Allah.
With regard to repeating al-Faatihah for this purpose, there is the
fear that it will lead to waswasah, then she will not offer any
prayers until she has repeated al-Faatihah several times. Waswasah is
a disease and an evil that one should beware of.
It says inal-Insaaf(2/99): It is makrooh to repeat al-Faatihah. This
is our opinion as it is the view of the majority of our companions,
and it was stated definitively by many of them. And it was said that
it invalidates (the prayer). End quote.
Shaykh Ibn 'Uthaymeen (may Allah have mercy on him) said: The words
"repeat al-Faatihah" mean repeating it twice or more.
The reason for that is that it was not narrated from the Prophet
(blessings and peace of Allah be upon him) that he did that. If a
person repeats al-Faatihah as an act of worship, there is no doubt
that it is makrooh, because if doing so were good, the Prophet
(blessings and peace of Allah be upon him) would have done it. But if
a person repeats al-Fatihah not as an act of worship, but because he
did not do it in the recommended manner, it seems that it is
permissible, such as repeating it because he forgot and recited it
silently when it is prescribed to recite it out loud, as happens to
some imams who forget and recite al-Faatihah silently. In this case we
say: There is nothing wrong with repeating it from the beginning in
order to make up for what was omitted of reciting out loud. The same
applies if one recites it without focus and wants to repeat it whilst
focusing on the second recitation; in this case repeating it has a
legitimate purpose, which is to focus with presence of mind. But if
there is the fear that this will open the door to waswaas, one should
not do it, because for some people, if they open this door they will
face a great deal of waswaas and when they recite it, if they are
careless in one verse they will repeat it. Then if they lose focus
when repeating it, they will lose focus a second time, and a third and
a fourth and so on, and then things will become very hard on him.
End quote fromal-Sharh al-Mumti', 3/331.
And Allah knows best.