You should, because there are things they could look at relatively trivially I think. Do girls who test as gifted who are in schools where girl-based methodologies are used do better, worse, or the same?

The US (IMO), outside of single-sex school proponents, is loathe to admit that not only do individual children learn differently, but that there are some significant differences in how girls-in-general and boys-in-general learn. And having teachers call on girls 50% of the time is an insufficient "fix" to the persistent issue that our educational institutions are based on how to teach boys.