Simplify the following text for a Grade 8 native English-speaking person.
Original: Mary Scott Harrison McKee ( April 3 , 1858 -- October 28 , 1930 ) was the first lady to her father President Benjamin Harrison , when her mother , Caroline Harrison , was seriously ill and then died .
Simplified: Mary Scott Harrison McKee ( April 3 ) , 1858 â `` October 28 , 1930 ) was the first lady to her father , President Benjamin Harrison . She became first lady when her mother , Caroline Harrison , became sick and died .