everyone went off on the test kits and didn't answer their original question.
They have gotten eggs from this fish before, so at least at some point, this fish was female.
Not every female is always showing an ovipositor, we had one that didn't show her's for a few months, she was definitely a girl though.
There's also a couple of users on here with females with beards. Try posting a couple of clear pictures of her, and hopefully someone will be able to help you.
(apparently if they're over exposed to testosterone, they will turn male, but this was done in a laboratory, and if memory serves, pretty high doses)