Well, she will looking for whoever "killed" Ranma!  Remember, she has NO
idea who did it, but she knows who the people that would want to kill him
are, Ryoga included.

First time I read it, I thougt that Akane might have believed that SHE was
the one who killed him with that wicked fast "kaban" (School Bag).
That would have left her in the position of thinking that Ranma had came
back for revenge... on her, while everyone else saying it was Ranma's Love
for her
that brought him back. 

Oh well.