Is hair extension permissible?
                                All Perfect Praise is due to Allah, The Lord of The Worlds 
It is impermissible for the man and the woman to apply a human`s hair as extension, but using artificial hair is permissible for the married woman after obtaining the approval of her husband so long as non-Mahrams don`t see her. And Allah Knows Best.
                             
                        
                            
                                
                                Is it permissible to go to the bathroom wearing a necklace that has the word "Allah" inscribed on it?
                                All Perfect Praie be to Allah, The Lord of The Worlds, and may His Peace and Blessings be upon our Prophet Muhammad and upon all of his family and companions.
Anything that contains words pertaining to Allah, The Almighty, is desired to be left outside when going to the bathroom, or to be hidden for fear of losing it. And Allah Knows Best.
                             
                        
                            
                                
                                Is a menstruating woman obliged to pray during menses, and should she make up missed prayers?
                                All perfect praise be to Allah, The Lord of The Worlds                                                                                                                                                                        A menstruating woman is prohibited from prayer during her menses, and she isn`t obliged to make up missed prayers. And Allah Knows Best.
                             
                        
                            
                                
                                Should one who doesn`t perform prayer out of laziness make it up later, and how should he/she do so?
                                All perfect praise be to Allah,The Lord of The Worlds                                                                                                                                                              He/she is obliged to make up missed prayers by offering with each obligatory prayer another one, and if he/she offers two, then it is better. And Allah Knows Best.