Simplify the following text for a Grade 3 native English-speaking person.
Original: Barbara Ann Mandrell ( born December 25 , 1948 ) is an American country music singer best-known for a 1970s -- 1980s series of Top 10 hits and TV shows that helped her become one of country 's most successful female vocalists of the 1970s and 1980s .
Simplified: She is an American country singer . During the 1970s and 1980s she had many Top Ten hits .