The whole book is on-line at FamilySearch. So I would think you could post a link to the page. (It's my understanding that FamilySearch's terms of service do not allow for duplication of images from their website to be used elsewhere on-line.) I'm not sure what your goal is, though. If the tree contradicts relationships already shown on WikiTree, you would still need to locate the evidence the tree is based on, discuss issues with other profile (and project) managers, etc.
Or alternatively, you could set up a free-space page to present all the information you've collected about Margaret Vincent's tree.
If I have misunderstood your question, please tell me.