Bertha may have married Mr. Myers and given birth to Raymond Myers. I have also seen last names of Holt (in mother's obituary), and McCullough (at Find a Grave).
1940 Census: https://familysearch.org/ark:/61903/1:1:VBKJ-2PZ
1930 Census: https://familysearch.org/ark:/61903/1:1:XC46-Y9S
1920 Census: https://familysearch.org/ark:/61903/1:1:MN1D-TTY
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Bertha is 29 degrees from Herbert Adair, 24 degrees from Richard Adams, 23 degrees from Mel Blanc, 26 degrees from Dick Bruna, 20 degrees from Bunny DeBarge, 35 degrees from Peter Dinklage, 21 degrees from Sam Edwards, 17 degrees from Ginnifer Goodwin, 19 degrees from Marty Krofft, 18 degrees from Junius Matthews, 19 degrees from Rachel Mellon and 20 degrees from Harold Warstler on our single family tree. Login to find your connection.
S > Summit | M > McCullough > Bertha Maudie (Summit) McCullough