Is it necessary to completely close the lips when pronouncing labial letters such as the baa (ب), or is it sufficient to bring a part of them together while the letter remains clear? And is it obligatory to repeat the prayers that were performed without a complete closure of the lips?

The questioner is experiencing many whisperings (waswas), and she should disregard them and not pay attention to them, as that is the most beneficial treatment for her. The letter "ba" (ب) is pronounced from between the lips by closing them together. As long as the questioner pronounces the letter "ba" clearly, her prayers are valid, and she does not need to repeat them. She should ignore this matter in the future, for obsession with the articulation points of letters is one of Satan's inroads.