Patricia:
The Mac is not the problem - unless there is an overriding situation with your operating system that interferes with internet use in general - but the browser and version could have something to do with it.
More likely it may be a temporary 'glitch' in the 'net or the connection (ISP server, etc) and will be fine another time.
Alternately, try loading her data from your "Family Tree" page (get there by clicking the tab so labelled on your Profile page) and then clicking the link to the blank where she should appear.
I hope this works..
Keith Baker