The Girl from Montana by Grace Livingston Hill

A lovable girl upon whom fate has thrust an unbearable burden of trouble, alone in the mountains of Montana and threatened by a man whom she has every cause to hate and fear, arms herself, mounts a horse, and bravely rides away. Thus begins a journey leading East to grandparents of a widely divergent social station. Her experiences are novel and sometimes humorous, but through them all she never quite forgets a certain tenderfoot who befriended her for a short time on her lonely journey...