Hi seablue,
It could be that your daughter is exhibiting imagination overexcitabilities which is not unusual in highly gifted children. I have just written an article on this which explains the research on this kind of difference in gifted children. The article is online at the New South Wales Association for Gifted & Talented Chidlren web site at this url
http://nswagtc.org.au/index.php?option=com_content&task=view&id=345&Itemid=80The examples I dealt with (in terms of advice for parents/students/teachers) was more for emotional intensity than imaginational but at least if you understand the background you will know which terms to use to search for other information and advice.
She sounds like a lot of fun by the way!
regards
Rosie