Hello. How often we, parents, force our children to share, because many people think that if a child does not do this, then he is “greedy”. But if someone told you that we have to give our things to another person, for example, to share our computer with a phone or wallet, what would you feel? Of course, the reluctance to give, it's your personal thing! It is wonderful that you spend useful conversations with the child, are engaged in the education of morality, tell us that sometimes it is necessary to share toys. For a child, his toys are also his personal belongings and of great value, as well as yours for you.
The daughter has the right and desire not to want to share her toys or sweets. Tell her: "You, too, sometimes do not want to give your toys, it happens."
No need to call the child greedy - it is very disappointing and unpleasant. But you also need to be able to keep track of those moments where the child’s natural emotional reaction to the actions of other people goes into the process of greediness. You can also use fairy-tale therapy and various game situations if you wish, and track exactly those situations and causes that make her hysterical.
What should mother do if, for example, a child in a sandbox was asked for a toy, but he does not give it away. Take the child aside and ask the reason for the refusal, maybe it is his favorite toy or he just does not want or is afraid that it will not be returned. Only after that you can use various techniques (have spare toys, play with toys, come up with a fairy tale, etc.)
Learn to calmly accept what your children do not want to share their toys. This is quite normal and does not mean that something is wrong with them. After all, each child must have their own personal belongings and the ability to dispose of them at their own discretion. Subsequently, when the new stage of socialization comes, she will understand that sharing toys means knowing how to attract other children and will be happy to give away toys to play. All the best!