Ooh, super difficult to tell. S/he is so little still. Does she have the little white bump on her underside, just in front of her fin? I can't tell on the pic, even if I zoom way in.
I'm having same issue with one of my "walmart rescues" that was labeled as Female -- I created a post w/ pictures...
10 Gal, my first brood from Mr. Poirot (Blue/Red Veiltail) and Ms. Ellie (Red/White Dumbo)
10 Gal, Mr. Ballou (inky Purple/Blue halfmoon?) + mystery snail, live plants - Betta Bulbs, Pothos, and water plants I can't pronounce...
29 Gal Sorority/Community: 8 Fm Bettas, 3 minnows, 5 Red Eyed Tetras, 1 stowaway guppie, 3 Ghost Shrimp, myst snails, live plants - LOTS of Pothos, Betta Bulbs, Amazon Swords
Misc. 5 Gal, 2.5 Gal, etc. for Quarantine, Breeding, etc