It’s not pertinant that Caylee’s neck was not broken. The fact of the matter is that Casey was looking for ways to kill Caylee, not that she actually used neck-breaking as a method. I know nothing about martial arts but does it actually teach anything about neck-breaking?!!
I don't know about the neck breaking, but google "liver shot" or "spleen shot" if you want an idea of what Casey Anthony was looking for in terms of the "ruptured spleen" search.
Yes. It seems as though, after poking through a menu of murder methods, she settled on chloroform as easiest for her. I do not for an instant think Caylee drowned.