What is the femine word for fellow friend?

There isn't a specific feminine word for "fellow friend". The term "friend" is gender-neutral.

If you're looking for a way to express a close friendship with a female friend, you could use phrases like:

* Close friend

* Dearest friend

* Best friend

* My friend (this works regardless of gender)

You can also use more informal terms like:

* Gal pal

* Girlfriend (though this can be confusing as it also refers to a romantic partner)

Ultimately, the best choice depends on the context and your personal preference.