Betty is a time traveler... who's experienced thousands of years of subjective time while exploring the past and future.
Betty had a bunch of wacky adventures with almost every famous historical person.
Alternatively, Betty is a slacker, and spent the last million years chilling. She knows very little of history, not much more than the Average Joe would know, because even though she was there, she didn't care.
"Name: Betty* Date of birth: None, predates time *predates last names"
Betty wakes up one morning to cheers and crowds celebrating as Emperor Justinian retakes much of Italy. She then falls asleep, and wakes up when Constantinople is being sacked by the Ottomans. She then wakes up again when the Battle of Gallipoli is heard in the background - and she shrugs it all off.
Zig Zagged: ???
Averted: All characters have reasonably human lifespans.