Yeah sure. They'd go fine. If anyone on here asks if I can prove that females go with male guppies I can easily tell them that I have a female betta living with 2 male guppies in a 6 gallon. Both guppies were added AFTER the betta and she just leaves them alone. Anyway, female betta's can go fine with just about any livebearer. They may not be fancy or have long fins but they make up for that because they can live with a bigger range of fish than males.
Cheers,
Paradise<3!