Q for those who know Latin

I’ve been pondering this one for a while, because I’m thinking about changing my user name.

I took Latin in high school, but remember very little of it. If I wanted to use the feminine form of “laetus” in reference to myself, how would I do that? What I mean is, I’m looking for a word or phrase that translates to “happy woman” or something like that. Is it just “Laeta”? Thanks!

P.S. Is “Laetitia” a French word or straight Latin?

The adjective is laetus/a/um. The femine form is laeta.

*Laetitia * is the Latin noun, meaning “joy”.