Very risky business. All betta males perk up and show off when they see a female. All you have to do is pull a sorority girl put her in a jar, then place it in front of a boys tank. Boys show off at first, flare, zip around., run away very excited. Also have seen them get along very well at first in the spawn tub..part of courtship. Then the other phase kicks in and you see the chase, nips and jumps, Ive seen a girl leap 8 inches and bounce off the spawn tub lid..ok time to go. Since the OP female is very likely not conditioned at all she will be terrified by it all. It may take a while but the outcome willl probly be a negative result. So why take chances like this with the health of the fish? Over 80 fish in 4 yrs in not so good. Most betta diseases can be prevented with good care in the first place or quickly fixed with proper knowledge and use of medications. Take the good advise given to you by people who have more experience. Do the right thing. Its like drinking and driving... you can get away with it for a while but eventually the odds are against you. Nobody says you cant do this..your fish right. Just saying you shouldn't is all.
Proud IBC member