Does a man's marriage to a mature orphaned girl who committed adultery at the age of nineteen, and who wishes to repent and be veiled, and whom this man helped commit to religious observance and convinced to wear the hijab and obey God, count as deeds for which he will be rewarded?

If a woman marries with the intention of being chaste and protecting herself, she will be rewarded for it if she repents sincerely and performs istibra (ensuring she is not pregnant from a previous marriage, or a waiting period). However, it should be noted that online marriage carries risks. It is essential to verify the girl's religiosity and character by asking trustworthy individuals, and she must adhere to the hijab.