First, how big is your cage for the two? That can make a big difference in how they react to each other.
Without seeing them, it sounds from your explanation that they’re simply sorting things out. By providing food dishes for each of them and an additional swing (or whatever they fight over) it could help too.
Despite the widespread thought that females can’t get along, it is not true. Plenty of girls are best friends. It just depends on the individuals.