First define biddah. Then answer is easy! Does she consider this to be wajib or sunnah or this her preference to do things which she may find to be beneficial. If one consider any extra thing to be wajib or sunnah then it is biddah. Is her action contray to shariah! from the sound of things she is not violating anything or even encouraging others to follow her example. Perhaps you can encourage her to do extra 2 rakah nawafil (salatul Awabin) salat after 7 rakah maghrib salat 3 fard, 2 sunnah 2 Nawafil. This way she will get alot more reward. Similarly she can perform extra 2 rakah after 20 minutes of sunrise . 2 rakah during dhurur time and 2 rakah after Isha salaat. www.askimam.org, daruliftaa.com Allahualam