Amelia Bones' death - a horcrux made?

[B.G.]

No: HPFGUIDX 136741

I've read the book twice but not until my CD came did it sink in that 
it is thought that LV murdered Amelia Bones himself. He has ever so 
many willing to kill for him but saves the important kills for 
himself.  Did he make a horcrux with her death?  If so that means he 
was not finshed or is not finished making his planned 7.  I wonder as 
well if he is making 7 horcruxes or if he is splitting his soul into 7 
pieces.  DD thinks the latter so I'll have to trust him.
Thoughts?
BG