Latest build, Insider one showed 23hours, i dont use phone so much anymore. It can last thru day, but if i would use it the way it was ment to be, i would charge it two times a day
Sorry for posting link this late. Didnt see request for picture.here it is full resolution
http://s32.postimg.org/j9rmjzkz9/C_Data_Users_Def_Apps_App_Data_INTERNETEXPLORER_T.jpg
Does she have Samsung phone? If it is so, she should check spam folder in messages or maybe check if your number is on a block list. Pretty easy to do on Samsung