The gender system of my daughter's conlang

I've been helping my 10-year-old daughter develop her first conlang recently. Last night, we were discussing gender systems, and she came up with the following

Masculine Men, boys, things particularly associated with men

Feminine Women, girls, things particularly associated with women.

Earth Solid objects and substances, landscape features, terrestrial animals, plants.

Air Birds, insects and other flying creatures, the wind, anything in the sky except for the sun and moon.

Fire Anything hot

Water Liquids, the sea, rivers and lakes, fish and other aquatic creatures, the moon (because of its influence on the tides).

I thought this was a particularly creative idea, and my daughter wanted me to share it.