Talking To Kids About Their Sin Nature without Damaging Their Self-Esteem

Today's question says, "how do I begin to teach my 4.5/yo daughter about her value and worth to God while balancing the sin nature conversation? I want her to understand but don't want to damage her self-esteem or think that she's bad or unworthy of God's love. Is she too young for this concept? Basically, how do I have the, 'you're not enough, but that's okay' conversation with a little one?"