Love is patient and kind; love does not envy or boast; it is not arrogant or rude. It does not insist on its own way; it is not irritable or resentful; it does not rejoice at wrong doing, but rejoices with the truth. Love bears all things, believes all things, hopes all things, endures all things. Love never ends. 1 Corinthians 13:4-8a
These probably are very good bible verses to read about the subject. They clearly state all the essential qualities that embody love in its purest meaning.
True enough, the woman’s love for the little girl definitely exemplifies the Scriptures’ definition of love even though the one she treats as a child is not really her biological daughter, but she never, even for a moment, fails to express her motherly love and affection for the child.