The excerpts provided do not contain relevant information about how she kept her promise to maintain their tree farm after her husband. Both sources are error pages or unrelated to the question, so no concrete details can be drawn from them.
Based on general knowledge, when someone promises to maintain a tree farm after a spouse passes, they often do so by taking over day-to-day operations, learning necessary agricultural or forestry skills, managing finances, and sometimes seeking outside help or consulting experts. They might also modernize or adapt the farm's practices to ensure sustainability and profitability.
Unfortunately, without specific details from the excerpts or additional sources, a detailed, fact-based answer cannot be constructed. If you can provide other sources or more context, I would be glad to help craft a thorough response.
