Chiranjit,
Consider that perhaps she doesn’t say those things back because she doesn’t want to. For what reason, be it fear of sharing or lack of feeling, is the question. Perhaps because you proudly exclaim how powerful your love is, you might not be giving her the space she needs to figure out where she is. Consider instead, just explore with her. Share your appreciation, sure, but not as “I love you, please love me back”, but “I really enjoyed the way you saw that, chose that path, said what you said.” These are the sun and rain that help whatever is blossoming on her side find the space it takes to figure out how she feels, and what she wants to do with those feelings.
With warmth,
Matt