Letters of a Woman Homesteader by Elinore Pruitt Stewart is just what you're looking for!
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From School Library Journal
Grade 7 Up–After deciding that city life as a laundress wasn't for her, Elinore Pruitt, a young widowed mother, accepted an offer to assist with a ranch in Wyoming, work that she found exceedingly more rewarding. In this delightful collection of letters, she describes these experiences to her former employer, Mrs. Coney. Pruitt's charming descriptions of work, travels, neighbors, animals, land and sky have an authentic feel. The West comes alive, and everyday life becomes captivating. Her writing is clear, witty, and entertaining. The 26 letters are brief and tell about her life on the ranch in the early 1900s. The author frequently and unnecessarily apologizes for being too wordy; she begs forgiveness for many "faults," like being forgetful, ungrateful, inconsistent and indifferent, all without apparent cause. On occasion, language reflects the racial prejudice of the time.