1. On the first two pictures do the little things on nods signal that it might be a girl?
Too soon to tell. You will only beable to tell once its goes into flowering, usually within the first 2 weeks.
2. Should I top my plant, and I mean now.
You could, it is mature enough to. Its a matter of preference. I topped my kush at 12 inches and it is now over 30 inches. if you are limited in space top it now, if not wait.
3. How is my plant doing in general?
Looks good, cant really see the bottom leaves... some yellowing? looks like it had soon issues but the new growth appears healthy.
4. I'm using a fertilizer called Bonnie's Herbs and Vegetables, the contents are 8-4-4 is this okay for growing?
not familar with bonnies, but the N is highest which is good for the veg state. if you start getting signs of nute burn or deficienies cut the strenght back. you will need differnt fert for budding though.
my biggest mistakes were bad water (ppm & ph) over nuting and over watering. once you get that down,the rest is easy.
what are you gonna be using for lights to bud?