She was accompanied by her brother, David Myers, who is an experienced long distance walker and was in charge of directions.
The weather was wet and windy for most of the day and Mary said that after seven hours of walking seeing Okehampton Library, where her colleagues had tea and cake waiting, was a very welcome sight.
She donated a copy of a local history book about Holsworthy to Okehampton Library to mark the occasion.
Mary said: “The walk has raised over £550 in sponsorship which is absolutely brilliant, people have been so kind and supportive and I’d like to thank everybody who donated or offered words of encouragement. It has also been really interesting to have conversations with people about the fact that we are a charity and to talk about what the library means to them.
“I see first hand the vital role that libraries play in the community and the difference they make to people lives. Libraries are a welcoming, inclusive space for all — from toddlers coming along to listen to songs and stories to adults accessing computers and IT support. As well as loads of fantastic books we offer a range of digital services, events, clubs and much more.”