Firstly never try to change your child from an introvert to an extrovert. This will only bring disappointment to you and will break down her self-belief. What you need to do instead is focus on her positives, which will make her blossom. Your daughter must have high self-belief and love herself just the way she is and only you can make that happen.
Introverts have inborn traits that cannot be changed. Through encouragement and use of the techniques suggested here, you can do things to make them more confident, have a high sense of self worth and be comfortable in social settings.