I'm missing the question.
Chasing could be mating rituals or it could be a territorial dispute. Mating does not always lead to breeding, keep an eye for buldges, if there is a sucessfull mating she will carry eggs for a bit before you need to worry about trying to raise the fry.
If she does get pregnant, how much time/money do you want to invest in trying to raise the fry? What other occupants are in the tank? What size is the tank? Are there a lot of decorations in the tank?