Meaning: She had a feeling of happiness or pleasure in her heart.
Choice of Words: Felt joy is a verb phrase which means to experience happiness or pleasure.
Alternative Expressions
She was filled with happiness deep inside.
Meaning: This means that she was very happy and felt good inside her heart.
Choice of Words:Filled means to be full of something. Happiness is a feeling of joy and contentment. Deep inside means inside her heart or soul. When you put them together, "She was filled with happiness deep inside" means that she was very happy and content inside her heart.
Her heart was bursting with joy.
Meaning: This means that she was so happy that she felt like she couldn't contain her happiness.
Choice of Words:Bursting means to break open or explode. Joy is a feeling of happiness and contentment. When you put them together, "Her heart was bursting with joy" means that she was so happy that she felt like her heart was going to explode.