Thank you to everyone for their help! I really appreciate it - everything we found was using the resources recommended on this forum. I thought I should post the final "history of Mark Island" paragraph she came up with.
Mark Island is one of 253 islands located on Lake Winnipesaukee and is one of Gilford’s islands. Mark Island is 93 acres. It looks different from many of the other islands because it has a big hill in the middle.
The Indians cleared the top of the big hill (177 feet above the lake’s surface) and used it as a lookout. Later George Sanders bought Mark Island in 1823 for only $200.00. A Mr. Webster made a dock and a cabin in 1911. Then a little while later he built 2 other cabins, one for each of his two girls. My family’s cabin is one of those first cabins. Logging occurred on Mark Island between World War I and World War II. Two big hurricanes, one in 1938 and one in 1954, knocked most of the trees down. After the hurricane people on Mark Island built a badminton court, horseshoe pit, a croquet court, an archery range, and a pistol range. Today there are many houses, and the trees have grown back.
She titled the brochure "Mark Island, An Island Paradise"
I guess she loves it as much as we do!