hey, your not alone in this situation. i have a pair that is doing the exact same thing. remove her, isolate her from the male for good. feed her live bloodworms or live food for about 2 weeks then try it again. also, the first thing that popped up in my head is this:
just over an inch in body length
about an inch and a half in body length
generally the male should be the bigger one. if you have a large female with a small male, he might not be able to be big enough to wrap around her, etc. and like everyone probably already said, let her rest for at least 2 weeks and try again. waiting is hard, believe me. i found out the hard way. my fish actually had vertical stripes, but when i placed her in with the male, all she did was run and hide, because he was too aggressive. then she lost her vertical stripes and they turned to horizontal. so, just take her out and keep them seperate. condition both of them. but usually, the female would have to be smaller than the male, i can't believe no one else saw this...
a heater will make them more ready though. its not necessarily an essential if you have a warm enough house, but betta fish reside from thailand, and it is a very hot climate there.
just trust me, and all the other people here. maybe not everyone, but people like turtle, oldfishlady, 1fish2fish. they are the guys you definately want to listen to every word they say. i went against their words like a fool and it just bit me in the butt. dont make my mistakes! please!