If your grandmother's profile has a profile manager, you can contact that person and explain the corrections you would like to see on her profile. Be sure you have sources to back up the changes. The manager might be a relative that you have just found and the two of you can collaborate.
Right now you are still a Guest and you have some limits on what you can do. There is an Upgrade link on both your profile and navigation page. Upgrading is completely free and when you do that, a Greeter will post a message to your profile containing a link to some very helpful items explaining how to use WikiTree. We hope you like what you see as a Guest and will Upgrade. We look forward to your contributions!