What should she do as she prayed against herself asking that she not be successful and her du‘aa’ was accompanied by an oath?

No File Exists
Check below answers in case you are looking for other related questions:
Ruling on masturbation and how to cure the problem
He is a student living in Denmark and he is suffering with the secret habit

No File Exists
Related Answers:
He swore oaths repeatedly and broke them; should he offer one expiation or several?
How sound are the reports that the du‘aa’ of the pregnant woman is accepted?
How can a person know whether finding things being made easy for him and having his prayers answered does not come under the heading of being led step-by-step to his ruin?
Ruling on masturbation and how to cure the problem
He is a student living in Denmark and he is suffering with the secret habit

Recommended answers for you:
There is no Sunnah prayer after the fard prayer of Fajr
She does not want to live with her husband’s family
Times when it is forbidden to pray
Can she masturbate if her husband cannot satisfy her desire?
Verses and hadeeth about hijab