4 year old won't show me her work?

My 4 year old took a while to settle in at school and at first, she would not do her best when it came to drawing, painting and colouring there..she would only scribble when she is actually quite advanced in art...well now she is settled in and has made little friends and enjoys going...she will do fabulous paintings for her teacher but not at home! Her teacher informed me that she is "very talented artistically...and paints very intricate pictures"...but at home she only does baby type scribbles! I don't pressure her..nor ask her to do other things...only provide paper paints and pens etc..I always say "Oh that's lovely" whatever she shows me...sometimes it is only a black line on the page....when I know she is capable of doing detailed pictures of people, annimals and buildings....why is this do you think? It's been going on for months and I realy want to see her do her stuff!