Dear A.,
As a social worker and a youth development specialist who trains youth workers across the state, I would recommend trying a different technique with your daughter. Instead of praising your daughter with words or with toys (bribes), try to re-phrase your praise to encourage her to express what she feels is good or worthy of her activities. So, instead of saying "Wow, that's a beautiful picture!" Say something like "I can tell you put a lot of work into your picture and used lots of different colors. What's your favorite part?"
This type of technique removes parents from being outside evaluators and makes our children identify what they like about their own work, regardless of an adult's opinion. Research is showing that this type of response builds self-esteem, self-worth, and allows our children to be their own motivator instead of being motivated by outside rewards or by somebody else's praise.
I realize this goes against everything we were told in the 80's/90's but as a person who didn't believe it and then tried it with my own 4 year old, I can attest it will make a big difference.
Here's a couple of articles:
http://www.eioba.com/a63022/praise_can_too_much_damage_yo...
http://www.growingwell.com/themes/theme_praise.htm
Best of luck! I hope you get other responses as well!
Sincerely,
A. C.