Well, first of all, have her Vetted (like you should have done before you got her). Have wolf teeth removed if she has them, make sure her other teeth are good and have her overall health and soundness checked, especially her back.
If she checks out fine, I would send her out for a few weeks of training.
If you are determined to DIY, start with letting her carry a snaffle bit for several hours for 2 or 3 days.
Then, I use a 'full cheek snaffle' and check a horse's head around SLIGHTLY to the back girth (each direction) on a stock saddle. I DO NOT tie a horse's head around very far. I want the horse to be able to bend or 'give' an inch more than the rein asks for so it can get complete release from any pressure.
Then, I ground drive the horse where I can get it trained to 'follow its nose', go forward and stop when I ask. You have a lot more control with your two feet on the ground. You smooch and slap the reins on a horse's butt to teach it to go forward you teach it to stop and turn. They are pretty much half-broke when I get on one the very first time. Sounds like this one needs to go back and do all of this again -- after a Vet check-up.