Nope. Her look shows us her whole tenderness or her all tenderness. . Not sure what this means. Maybe a cultural thing? . Her appearance shows us how tender she is. Does it? ... the extent of ...

Mr. Jon.. thank you so much for your help, Sir

I would say "her look expressed all her tenderness".

Thank you so much, Mr. Robert

" Her look shows us her whole tenderness or " Her look shows us all her tenderness