Help! 12 month old Bernedoodle

I need some reassurance/advice about my 12 month old large bernedoodle (80lbs). I call her a sour patch kid (sometimes sweet, sometimes sour) she is so good in the house & when we are doing training lessons inside. We go on a walk and she changes – jumps on me, bites my clothes and shoes, barks at me with frustration – I have tried acting like a tree, redirecting & all the treats. The treats make her worse, when I bring them on a walk she than jumps at me nonstop to get them. We are working with a positive re-enforcement trainer and she has given me advice and of course when she is here working with us she is better! I feel lost and in the thick of it with no end in sight. Advice or just reassurance things get better!!