Betta Fish: Boy or girl betta?

This is my Betta Elentiya. Pet store cup said Elephant Ear Female, but now… I am not so sure. Anyone have any opinions? Im getting mixed answers.

I have had her for five months in a 5.5 gallon and she had very little fin growth. A week ago, I started seeing signs of active fin rot, so she got moved to a ten gallon tank and is on day 6 of Paragaurd treatments.

In the past six days I have noticed so much fin growth, more than in the whole five months I have had her. I am thinking she might have had some very mild fin rot this whole time that was just keeping her fins short. There is now clearer black and iridescent blue marbling too. Or maybe the 5.5 was too small for her, and she is less stressed in the 10?

She has an egg spot, but I have heard that for some species, like elephant ears, some males can get “false obviously ”. You can see it in like the last second or so of the video.

I made a post earlier, but since she was sick I made it with flags and did not get a lot of responses. My friends who keep bettas (but no elephant ears/dumbos) have all told me different things. Everyone seems split 😂