Background: Dame Helen Lydia Mirren,  (nee Mironoff; born 26 July 1945) is an English actor. Mirren began her acting career with the Royal Shakespeare Company in 1967, and is one of the few performers who have achieved the Triple Crown of Acting. She won the Academy Award for Best Actress in 2007 for her performance as Queen Elizabeth II in The Queen and received the Olivier Award for Best Actress and Tony Award for Best Actress in a Play for the same role in The Audience. Mirren's other Academy Award nominations include The Madness of King George (1994), Gosford Park (2001) and The Last Station (2009).
Context: As a result of her work for the National Youth Theatre, Mirren was invited to join the Royal Shakespeare Company (RSC). While with the RSC, she played Castiza in Trevor Nunn's 1966 staging of The Revenger's Tragedy, Diana in All's Well That Ends Well (1967), Cressida in Troilus and Cressida (1968), Rosalind in As You Like It (1968), Julia in The Two Gentlemen of Verona (1970), Tatiana in Gorky's Enemies at the Aldwych (1971), and the title role in Miss Julie at The Other Place (1971). She also appeared in four productions, directed by Braham Murray for Century Theatre at the University Theatre in Manchester, between 1965 and 1967.  In 1970, the director/producer John Goldschmidt made a documentary film, Doing Her Own Thing, about Mirren during her time with the Royal Shakespeare Company. The film was made for ATV and shown on the ITV Network in the UK. In 1972 and 1973, Mirren worked with Peter Brook's International Centre for Theatre Research, and joined the group's tour in North Africa and the US, during which they created The Conference of the Birds. She then rejoined the RSC, playing Lady Macbeth at Stratford in 1974 and at the Aldwych Theatre in 1975.  Sally Beauman reported, in her 1982 history of the RSC, that Mirren--while appearing in Nunn's Macbeth (1974), and in a highly publicised letter to The Guardian newspaper--had sharply criticised both the National Theatre and the RSC for their lavish production expenditure, declaring it "unnecessary and destructive to the art of the Theatre," and adding, "The realms of truth, emotion and imagination reached for in acting a great play have become more and more remote, often totally unreachable across an abyss of costume and technicalities..." According to Beauman, there were no discernible repercussions for this rebuke of the RSC.
Question: What significant events occurred during her early years?. Whats the answer?
As a result of her work for the National Youth Theatre, Mirren was invited to join the Royal Shakespeare Company (RSC).