Rosita is probably the least impactful character in Rick's group at the current time. Everybody else appears to have some sort of role, storyline, interesting story to tell, whereas Rosita is yet to really do anything at all. And in the comic books she's reduced to little more than a head on a spike. A female villain we haven't seen yet in the show, Alpha, disguises herself as part of the group before luring Rosita away and slicing her head off. There are many more heads on spikes plunged into the ground to form a borderline between Rick and the group's territory and Alpha's. Andrea - who is shockingly still alive in the comics as RICK'S GIRLFRIEND - finishes off he reanimated Rosita.