In Romeo and Juliet, an event that shows the Nurse's love and concern towards Juliet is when the Nurse tells Romeo in no uncertain terms that if he should lead her into a fool's paradise or try to trick her in any way, then it will be an evil thing to do to any woman.
But first let me tell ye, if ye should lead her into a fool’s paradise, as they say, it were a very gross kind of behavior, as they say. For the gentlewoman is young, and therefore, if you should deal double with her, truly it were an ill thing to be offered to any gentlewoman, and very weak dealing.
(act 2, scene 4, lines 162–167)
With these forthright words, the Nurse is showing her love and concern for Juliet. She wants nothing but the best for a young girl she treats like her own daughter.
She's understandably worried, then, that Romeo's not being serious in his professions of love for Juliet. If he isn't, then there's every danger that Juliet will end up being hurt, and that's the last thing the Nurse wants to happen.
In fulfilling the promise she made to Romeo the night before, Juliet has sent the Nurse to him to make sure that he's managed to find a friar to perform their wedding ceremony.
It's evident from her remarks in the above excerpt that the Nurse is every bit as keen as Juliet that Romeo has been able to do this, as this would clearly demonstrate Romeo's commitment to going through with the wedding. Once again, we are presented with clear evidence that the Nurse genuinely loves and cares about Juliet.