thx a lots of all useful suggestion. After taking yr advice, these days i try the following to motivate/ cultivate my daugther's learning in musical instruments:~
firstly, i reduce the duration of practice n ask her to focus on particular area requiring technique improvement.
2. i praise her whenever she can achieve even for little progress n avoid criticizing her
3. sometimes i sing the melody while she plays n we take turn to do this.
4. as encouragement for her, i will gather her favourite dolls as her audience while she is practicing.
5. i played musical cd at a fixed time and try to discuss with her abt the music she is listening to.
it seems she is more enjoyed in her progress of learning though she is still learning in a walking pace. anyways, i hope music is her life long friend so i am now taking a longer sight .