Whenever she does not get what she wants, my 3 years old daughter would say that we don't love her. What should I do to discipline her? I do not want to spoil her.

Hi Jaymee! Have you tried asking her why she think that way? Do you give her toys or reward in a form of bribery? If so, then you can try to lessen the bribery but you can keep the reward system still there as part of your way to raise her. Your child might probably see that sense of entitlement for doing so. You might want to check this link https://www.empoweringparents.com/article/i-want-it-now-how-to-challenge-a-false-sense-of-entitlement-in-kids/ Let me know how it works! :)