One may say that the best du'a for forgiveness is the one preserved in the immutable text of the Qur'an 7:23 in the following words:
قَالَا رَبَّنَا ظَلَمْنَا أَنفُسَنَا وَإِن لَّمْ تَغْفِرْ لَنَا وَتَرْحَمْنَا لَنَكُونَنَّ مِنَ الْخَاسِرِينَ
They said, "Our Lord, we have wronged ourselves, and if You do not forgive us and have mercy upon us, we will surely be among the losers."
If there is no non-mahram man around and women do not attract men's attention by doing so, there is no problem; otherwise it should be avoided.
With prayers for your success.
Bahira (Arabic: بحيرى, Classical Syriac: ܒܚܝܪܐ), or Sergius the Monk to the Latin West, was an Arab Ebionite, Nestorian or possibly Gnostic Nasorean monk who, according to Islamic tradition, foretold to the adolescent Muhammad his future as a prophet. His name derives from the Syriac bḥīrā, meaning “tested (by God) and approved”.
My family is all Sunni, very few of us are followers of the Ahlulbayt, but not openly.
The Qur'an says: "The Prophet is closer to the believers than their own selves and his wives are their mothers" (33:6). What has been established by the Qur'an is the prohibition for men to marry the wives of the Prophet. The prohibition for a sayyedah to marry a non-sayyid is a wrong assumption and analogy. We don't find any instruction as such in the sunna of the Prophet and the teachings of the Imams after him.