It was a very interesting time for England
Her Uncle King Edward, abdicated the throne to marry American divorcee socialite Wallace Simpson, in the mid 30s, just as Hitler was beginning to steamroll neighboring Countries.
Her Father, George, had a horrible speech impediment, but became the defacto King and subsequent Head of State at the beginning of WW2 as The Parliament couldn't agree on a PM or policy direction w Germany. Chamberlin eventually quitting and Churchill taking over.
The Queen drove an abulance during the war- she served up there w the boys.
Fast forward, England survives the war, but her Father passes away from throat cancer (he reportedly smoked 4 packs a day) and oops, you've got the 26 year old Queen w her Greek royalty husband (Mountbaten was of Greek aristocracy, but he too a decorated naval captain in WW2) and together the accidental Queen & her Prince gave stability and pride to a Countrt during a rather tumultuous time.
Great biographys out there regarding her.