text: tell her it is normal for females to have a cycle that comes every month, tell her how to keep herself clean and to change her pads, also explain there might be some cramping or butterfly feeling in her stomach when it's time for her cycle, also what she should take for it like midol, there could be bloating, maybe buy her a cute little purse so that she can carry her pads in it. just try to comfort her in anyway you can. also tell her most females carve chocolate during this time. also where is your mom she can also comfort her and explain to her what is going on with her body. tell your sister it is a normal part of growing up. good luck sweetie.