Fear IS magnified at points during the teenage months so reactivity will tend to get worse here.
Also, you are in the darkest of days, from a training pov. These are the months when, just like with humans, hormones are driving your dog to test boundaries, see how she can change the world around her, prioritise things other than you etc.
Repeat: it will get better, it will get better, it will get better.
If you are struggling to make headway with training then it is absolutely ok simply to manage the dog's environment so that she doesn't have a chance to misbehave. Training can begin again in earnest when she's a bit older.
If she's reactive then it's fine (even preferable) to walk her in locations she doesn't have to get close enough to other dogs to react. Even to not see other dogs at all, just while she matures.
If she doesn't recall then it's fine to keep her on a lead or long line (attached to a harness) so that you can take back control when needed, without given her chance to practice ignoring a recall.
If she jumps up at guests or you when you come home, it's fine to use a baby gate or house lead to keep her under control.
If she runs off with your shoes, it's fine to chuck a bit of sausage to distract her while you get it back.
None of that means you are a failure. The dog you have now is not the dog she will be in another year. Maybe even another 6 months. It is fine to simply keep her safe, you sane and protect the relationship between you all until she is a bit older, wiser and you can start training with her again.