Conversation so far:
What happened in 1961 for Tippi Hedren?
On October 13, 1961, she received a call from an agent who told her a producer was interested in working with her.
who called Tippi Hedren?
An agent who told her a producer was interested in working with her.

Question: then what happened?
Self-contained rewrite: then what happened after the agent told Tippi Hedren a producer was interested in working with her?