Hello, and welcome to the forum and the world of betta-keeping. :)
I agree with the others, she's pretty fat and I see a budge on her side. Fast her for 2-3 days and if the bloating isn't gone, do an Epsom Salt treatment. (We'll get to that later)
Aqueon Betta Food isn't bad, but it's not really good either.. I recommend New Life Spectrum Betta Formula or Omega One Betta Buffet Pellets. Pellets are best as the staple diet, and NLS food is better than Omega because NLS doesn't have wheat gluten.
And, 5 gallons is perfect! She should be really happy in there. ^.^ She's a VT.
5 gallon is good, just be sure to get a lid and cover all of the holes with a breathable cloth or loosely taped cardboard so she can still breath. My girl jumped out of her tank through a tiny hole in the lid, and was out of the water at least a half an hour before I found her. She's ok, but other fish aren't so lucky when they jump out, so please, please, please get a lid and cover all the holes.
The water is not too high for the betta but barely like a cm lower for a lid.
my tanks have almost 2,5 fingers till the lid, I wouldn't want them hitting the lid when tempted to jump. Also gives them a little more air since the tank is pretty well closed mine is at least. I always leave the lid partially open for a few here and there so new air can be in.
kozmaniac22, Welcome! so far by the looks of things. Your already giving your betta a much better life than her last owner did! This is the forum to be on for bettas, any questions you have, just keep posting them here and I'm sure you will keep getting very knowledgeable answers! shes a pretty fish and your tank looks really nice! Im sure shes really appreciates the new home!!
You seem to be doing well already with her =) I definitely agree she looks super bloated and letting her fast a day or two won't harm her. I haven't found New Life Spectrum anywhere, but the Omega One Betta Pellets (be sure to get pellets, not flakes! as flakey food can be a direct cause of bloating and make the water messy) are small and my four bettas eat them no problem.
You also might want to consider some live/frozen food like daphnia or bloodworms. Though I'll admit the blood worms are gross, betta LOVE them. Just take care when feeding. Not more than 2-3 pellets twice a day, and the frozen blood worms I only feed mine 3-5 once a day (since they're quite long and altogether a bigger meal than just pellets).
I don't know about females vs males jumping, but my female is a regular jumper just for fun or to get to her food if she finds herself on the wrong side of the leaf I always feed her on =P But she can definitely get some speed and height.
But I think what you're doing for her already is wonderful and a big improvement for her! Welcome to the forums, and good luck with your new betta friend!
I really appreciate the feedback everyone! This is a wonderful forum. I'm amazed at how active and helpful everyone is. I just ordered a lid and am usin some plastic wrap in the meantime to keep her from escaping. I'll let you all know how the fasting goes as well. I'm also planning on getting her some bloodworms.
I must say, I definitely did not plan on getting a Betta, but she sure is fun and may be one of the best "accidental" things that ever happened to me. Thanks again!