Morena could mean this:
Morena
A spanish word used to describe Latinas who are tanned/dark (i.e., dark hair-brunette, dark eyes, dark skin) in varying degrees. Used in contrast to Gringa or Guedo for a White Latina, Negra for a Black Latina and Asians aren't usually included in this definition.
Someone as light as Jessica Alba would be considered Morena esp. if she is brunette through to someone as dark as Christina Milian