According to the records of the North American Regional Studbook for the Asian Elephant, Berth was imported from Assam, India, in June 1956 and sold to the Adams Brothers Circus around March 1958. A June 1958 article in The Billboard announces the Tote-Em-In Zoo has purchased a baby elephant from importer Fred Zeehandelaar.
Thus, it would be an assumption this new baby elephant was a replacement for Bertha. However, only three elephants are listed in Studbook records for George Tregembo's Wilmington, North Carolina, zoo.
Bertha, arrived 06/1956, left 03/1958
Dixie, arrived 09/1959, left 03/1960
Matteau, arrived 12/1966, died 11/1991
More information is sought regarding this mystery elephant's identity.
A previous ShowMe Elephants article discusses Dixie's history, the elephant assumed to have replaced the mystery elephant discussed here.
>> "Candy Hitchcock Collection - Dixie" at ShowMe Elephants