Conversation so far:
Was Patsy Cline musical from childhood?
At age 13, Patsy Cline was hospitalized with a throat infection and rheumatic fever. It was during this time that she developed an interest in singing.
When did Patsy Cline discover she had talent for singing?
At age 14, Patsy Cline declared to her mother that she was going to audition for the local radio station.

Question: When did she start singing professionally?
Self-contained rewrite: When did Patsy Cline start singing professionally?