"Not Responding" often means FTM is processing data and can't yet refresh the screen.
This is particularly true at the Family Tab, where the Index is, when options like "use married" names, or "use aka as separate item in the index" are selected.
These options are at Options > Tools > Names tab, lower left.
There might be other options that are slowing down processing so that FTM is unable to refresh the screen.
At the same screen, does she have the setting checked for FTM to continuously check the internet? I have never checked that box, so don't know how that would slow things down.