She's a little beauty!! Female bettas have awesome personalities.
She looks bloated, so I would advise you to fast her for a couple days, then offer a tiny piece of frozen thawed pea. Feed frozen bloodworms (maybe 2) since bettas are carnivores, and not freeze dried which can swell in their stomachs and cause constipation. Frozen brineshrimp are usually popular as well!
You can teach her to eat pellets by withholding food for a day, soaking the pellets and if necessary, cutting them in half since she looks like a tiny little one.