Is a Woman in Mourning Permitted to Dye Her Hair Within the Thirty-Day Period?

Greetings, It is forbidden for her to dye her hair until after the thirty days have passed. However, if she is married, it is permitted for her to do so immediately after the seven-day period (shiva). If she is in the process of shidduchim (matchmaking), it is permitted even during the shiva. 

Sources: See Shulchan Aruch, Yoreh De'ah (siman 403, se'if 6). 

Best regards, Hillel Meirs