Most females will just not lock. Other girls get a little irritated with an eager male, and she'll stay as far away from him as she can. Rarely, she'll get so upset by the presence of a male when she's getting closer to the egg thing she may actually throw her body around and trash the tub in an effort to get him to leave.
Lots of people do night drops, lots of people don't. The main thing we are trying to tell you is not so much "Don't do this!" but more, "This isn't necessary in order to successfully breed." It is mainly a matter of experience and preference, as well as being prepared for what can go wrong, as well as right. Being a little too loose with night drops can easily result in an RI, especially in a very cold and/or damp climate.
I have an import female myself, three seasons I've had no luck getting her to lay. She locks, but doesn't really build or anything else. So this time around, I'm going to bite the bullet and try night drops with her. The trick will be, she's in a rack with 5 other girls who don't need the night drop. So it's going to take some planning on my part.
And try Barry White. That always works for me.
Gale