Why would you think that telling her that you like her would be a good idea? She's already told you that she didn't want to kiss you (you should have never asked but just simply waited for a right moment when she was showing you in body language that she was open to it.) That means she's not open to any kind of casual sexual/romantic relationship with you)and, she's clearly told you that she doesn't want to be in a relationship. That means she is not interested in any kind of commitment to you either.
After dissecting that for you can you honestly say that you should tell her how you feel?
I suggest you completely give up on this one or you will end up being like her faithful Labrador Retriever who follows her around begging for a treat or a bit of attention.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion