Some of this is not a training problem, and treating it like one wastes time your dog may not have. If they are distressed when you leave, if they growl or guard their food, their toys or you, if they are frightened on the lead, or if anything about them changes suddenly at any age, contact your vet the same day. A tip from a website, ours included, is not the answer. If it cannot wait, contact your nearest emergency vet now.
With a Goldendoodle, watch the way they move, their ears and skin, and their weight. A young dog who sits down on walks, skips on a back leg or bunny hops can be showing their hips or knees. Head shaking, hours of paw licking or scratching at night is often itchy skin, not restlessness. A dog who slows down and gains weight on the same food can have an underactive thyroid, and nervousness in dim light can be their eyes. From seven, for a new lump, a cough or tiring early on walks, contact your vet the same week. In an older dog, pacing at night can be the start of Cognitive Dysfunction (dementia in older pets). Bloat (GDV, a twisted stomach) is most common in large, deep-chested dogs, so skip walks and hard play shortly before and after meals. A swollen, tight belly, retching with nothing coming up, sudden restlessness or drooling is an emergency: contact your vet now.
She'll keep finding water. If she shakes her head after, dry her ears and call your vet.