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.

i think at 3 years she is still very young to associate something like this with you not loving her. i am sure she picked it up from TV or from someone else she is closely associated with. try talking to her the next time and ask her why she thinks mamma does not love her. also, tell her that yes, mamma loves her. but there are some things that are not good for her. also, start giving her reasons for why you say no instead of just saying so. for instance, if you say no to ice cream, explain to her in her age appropriate way what eating ice cream can do to her mouth and teeth. babies are smart and she will understand more than what you give credit to her for.