It seemed that Rina was wary and jealous of Nambra. Although she was a former enemy, she said what she wanted and didn't give up on it even after Luke's refusal. Not to mention, she didn't show any hesitation or regret. Rina could tell that she was serious about her mission to not let her people die, though. Whatever her goals were or what she was willing to do to achieve them, at the very least, she was someone who deserved respect and admiration. For the sake of her species, she was doing something that few people would be willing to do. Also, Rina could only imagine what someone would feel when they were the last of their species... it was a feeling that would make anyone feel shivers.