Prayer

It is permissible because when you only say Mu’mineen, this refers to Muslims – good and bad-.

It is permissible to pray loud of these Sunnah prayers but is it not recommended. As for “Tahiyatul-Wadhu”, I don’t know what that means.

This would be an innovation. You can only make Du’ah and ask Allah for whatever you want.

If you leave home after making wudhu and you remain in the state of wudhu until Thuhur time, you can pray it without making another wudhu. But if you nullified your wudhu, you have to make a new one in order to pray and you have to wash your feet as it is part of […]

If the Iqamah started, it is forbidden to begin any prayer except the mandatory prayers.

Your prayer is correct but you should have offered two prostration of Saho (forgetfulness) after the salam and then offer and other salam after it.

This is correct.

You don’t have to. It is a Sunnah

Once she feels that she has settled, she should complete the prayers. This might be after 2 or 3 weeks. If she doesn’t fell settled at all and is always on the move, she can shorten the prayer the whole time.

You have to finish the Fatiha and try to recite it a bit faster even if you delay going to the Ruku position a bit. If this happens in every Rak’ah, there is something wrong either in your Imam or in your own recitation.