Some of what you wrote it typical dog, some is typical boxer. In other words, there is nothing "wrong" with Cassie!
Dogs learn who is caring for them, looking out for them, and when that person is "missing," if they worry. If there are 2 or 3 folks caring for the dog, they won't miss the "key person" as much. But it sounds like Cassie's world revolves around you. Now you are gone back to school, she doesn't know who is going to feed her, play with her, give her belly rubs, all those important doggie things. So you have major separation anxiety happening.
Dad and I were caring for all 5 here, though I did most of it. In the past year, Dad's dementia has worsened quite a bit, to the point that even if a dog barks to go out, he forgets and just hollers, "QUIET!"
Now, I go out grocery shopping and the dogs are a wreck, cuz they don't know how long I'll be, if I'm coming back, what if they have to eat, etc. It is hard to work with.
Slobber, well, boxers DO that. She is just getting into it big time, and the anxiety likely makes her drool even more.
Boxers have short attention spans. Proper training schedules for a Boxer are short 5 minute stints, multiple times per day. (Unlike say, a Golden, who can have 2 half hour sessions per day). Even where I take my flock for training, where sessions are one hour per week, Boxers and one other breed (I forget just now) are allowed to attend for half an hour over 2 sessions for the price of one session, because they are KNOWN to have this short attention span. (It is a group class, so the dog isn't "on" the entire half hour.)
Training is not a one time and done deal; it is for life. So the 'lost' leash training may be due to you starting school, getting busy, and forgetting to keep up with her on this. So she decides it really doesn't matter. This is dog, not boxer-specific.
Getting into the pine cones may be boredom or may be anxiety. Cassie has had a huge change in her life routines and it is troublesome to her.
If you are the type who learns from reading, you will find some of Patricia McConnell's books helpful. Of course, then you still have to do the work and practices. If you go the trainer route, group classes are the way to go as one on one is extremely costly, and will only work as long as YOU absorb it all and do all the homework and practicing, something you will need to do anyway.
Good luck!
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