Hello again myweebaby!
It is usually recommended that you flea your dog every 4 weeks, especially between March and September, and worm her every 3 months.
Our dog is flead every 3 weeks as he has a flea allergy (something to consider in your girl maybe?). We also flea spray the house.
I only worm every six months, and de flea only when I see evidence of fleas. I use Frontline spray from the vet, and it lasts up to two months each spray. I would not use the spot on every month.