The tests which you mention were administered at a young age. If you decide to test again, the detailed subtest results may provide helpful information about any possible concerns you may have for potential learning differences or executive function issues.
Meanwhile enjoy your budding artist. She may just have a mild, mellow personality.
As far as the question of exposing her to more, this may be limited by time, money, and interests. Are there specific subjects, destinations, sports, or experiences which might be of interest to her and/or to your family, or extended family?
When considering whether school may have caused her to lose curiosity and drive, do you have reason to believe she may be underachieving? Has she discussed her school experiences with you? Does she have friends and intellectual peers in school and/or outside of school? Does she have great ideas but need adult guidance in how to use these ideas to establish goals and make a step-by-step plan to achieve them? Are there art classes, shows, and/or competitions she might enjoy participating in? Is she generally happy and healthy?
Gifted kids may not necessarily be farther along the traditional path, each may have their own path. This may both invite comparison and also make it difficult to compare/contrast with other kids the same age.
You ask if you've done something wrong as a parent, LOL, everyone has. Few, if any, lives are optimal, however kids and parents can be resilient and keep learning. For encouragement and reassurance in raising a gifted child, many find the book
A Parent's Guide to Gifted Children helpful.
