Agree its a female.
Here are a couple females I had.
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Now a male (below)
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Note the lack of melanin in the dorsal, but also notice the array of iridescent spots it does have on the fins and body, lacking on the females.
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Anzo, it is a little difficult on yours, because there are typically male spots on the dorsal, and the dark area usually on females
But below, a femaleI had that had some spotting on the dorsal (a lot may depend on if there is a male in the tank), below at the time of the pic, no male was in the tank.
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After a male was added, she turned to this below
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