Watch her, not only behavior but physical signs that she is ready to breed- swollen abdomen, her ov spot will almost be tube-like when she is ready to release eggs.
As mentioned above, some just do not like each other and will not work regardless what you try.
How long did you condition them, and how?
Also, if you want more of the male's attributes, then I would get a female that is delta and/or dragonscale- VTs tend to be dominant trait.
Would also remove the snail until after the fry are free swimming, as they are good at cleaning up the dead eggs, when they run out they will eat the good eggs.
What set up are you currently using?