Evelyn, the way it works is that a profile manager (presumably you) can add another member to the trusted list for a profile. The new trusted list member will be able to edit the profile, regardless of its privacy level. There is nothing to get into - the trusted list is simply displayed on the Privacy tab and managers can edit it. It sounds like what she wants to "get into" is a particular profile ... in fact, it sounds like she wants to be added to the trusted list for YOUR OWN profile, which is something you might not want to give her full access to ... then again, you might ... it's up to you!
To add someone to the trusted list of a profile you manage, click the Privacy tab and scroll down past all the privacy levels to see the trusted list section. You will be able to enter the email address of another WikiTree member to add that person to the trusted list. After they are on the trusted list, you will also have the option to make them a manager - a profile can have several managers.