Nill honestly and genuinely loves Uryuu, and that's only in part from hanging around Shikamaru too much back in the day. It's platonic love, but it's still love. Nill mostly tries to judge people based on her they treat her, but when it comes to Uryuu she almost entirely judges him based on how he treated Shikamaru... and he made Shikamaru happy, which is something (she thinks) that she could never accomplish. Uryuu has Nill's unwavering loyalty, because he was good for Shikamaru and he loved Shikamaru and he made his life so much better just by being there. In general Nill likes Uryuu a lot, but she'd take several bullets for him just because he was the person that was there for Shikamaru.

She also thinks that Uryuu is a lot braver than her, whether he necessarily meant to or not, because Nill tried to pull the trigger and put Shika out of his misery and she couldn't do it, but he could. Uryuu could turn the whole world against him, but Nill will never turn away from him, because she feels like she owes him more than she can ever repay, even though he never really did anything for her to warrant repayment.