was she/ she was

Not only WAS SHE the first to found training schools for nurse, she was also the first women elected.

Dlaczego was she a nie she was? Jaka jest różnica pomiędzy tymi dwoma formami gramatycznymi?

Uczyłaś się już może o inwersji?

https://www.ang.pl/nauka/gramatyka/zdanie/emphatic_structures

dzięki!