Hello Patricia.
Margaret Elizabeth's maiden name is Bush.
According to the 1910 Census Dallie (Dahlia L., line 66 of the Census sheet. Link below) had two brothers named Arch (9 y/o) and Irvin (3 y/o):
https://www.familysearch.org/ark:/61903/3:1:33S7-9RJR-9MQ2
Arch died on 1954 and Irvin (Ervin) died on 1958. Their certificates of death lists their mother's maiden name:
Arch: https://www.familysearch.org/ark:/61903/3:1:3QS7-L9GC-KSMD-L
Ervin: https://www.familysearch.org/ark:/61903/3:1:3QSQ-G9DL-HJCP
Margaret was the daughter of Calvin and Lucy Bush. Margaret (Line 38 in the Census sheet) was born in Virginia ca. 1870.
1880 Census: https://www.familysearch.org/ark:/61903/3:1:33S7-9YBM-9SKC
Calloway and Margaret got married ca. 1887. They were living next door to Margaret's parents on 1900. According to the 1900 Census Margaret was born on Apr 1871 and Dallie (Dallia) was born on Dec 1894 (There is an error in the DOB's year for her and her siblings James and Lucy).
1900 Census (Them all are listed at the top of the page): https://www.familysearch.org/ark:/61903/3:1:S3HY-DKT4-PH
Dallie survived her husband. She was the informant in the certificate of death of Henry Hall:
https://www.familysearch.org/ark:/61903/3:1:3Q9M-C9YV-4SC5-5
I hope the information above helps in your search.