I'm a professional dog trainer and have trained in many disciplines including tracking, scenting, protection, precise obedience, etc. I've trained with the police and the military, too. I don't care the size of the dog - an 11 month old dog that is biting is crossing the boundaries. Tulip is showing you that she wants to be boss. She is testing her boundaries. You MUST take charge and be the boss.
It can be cute when they are puppies and are mouthy. Just wait till they are 2 years old and are mouthy with your 2 year old child. It WON'T be cute then. The behaviours you allow and nurture now in puppies and young dogs, are the very behaviours that they will bring with them into adulthood. If it is okay now, they will not understand why all of a sudden one day when they are older, it is no longer okay.
You should find someone locally to help you to break this behaviour or else spend some time reading and researching to learn for yourself how to be the boss in the dog's eyes. Please don't use the choke if you don't know what you are doing. Find a good, professional dog trainer. Someone who does not use clickers or electric collars. Someone who can train a dog without those distractions and crutches knows what you need to learn to take charge of Tulip.
Sprays, collars, clickers and all that other stuff -- you won't always have them available to you and in your hands, but you will always have your attitude and your brain. It's your attitude and behaviours towards the dog that is going to make it mind you when you tell it to.
While you are researching/trying to find a trainer, start now by giving Tulip tons of exercise. Tire her out every single day. Teach her to use a treadmill if you have one and can't keep up with her. Take her on walks and don't let her pull or be in front of you. This is all groundwork for you and an outlet she needs.
Good luck to you!