She doesn't know any better. Ever since she was little she only had animal zombies as trustful companions. As her relationship with Moria, Absalon and Hogback was pure business.
For the next two years she get to interact with Zoro, treat his wounds, watch him work his ass off getting stronger for the sake of his nakama. Flag1982 just wrote an essay about this subject. Would be silly to completely repeat it.
Eventually as she learn the meaning of real nakama, (while interacting with Zoro, maybe also the other Straw Hats) her dream would evolve to something better.
@ vorlianis and Deicide
My point is:
Perona was SHOWN holding the paper, figuring out Luffy's message. The same was as the rest of the crew.
Reilight, Hanmock, Fullbody, Jimbei, Pandaman, Enel NOT.