She probably died of old age, and I highly doubt she was much stronger than the average ninja...I could be wrong, but she didn't utilize ninjutsu. Imho Madara, Hashirama, and many others can do what she did, but to ninjas and not "ordinary" humans imho. Idk tbh, but I'm just confused at how she used only chakra to do it. I wonder if she was similar to Tsunade...just very very powerful physically. Idk...Juubi could have also killed her...then The Rikudou avenged her idk...she's a mystery no doubt, just like The Rikudou....