This may be worth considering. Data from Ancestry.

Lunacy Patients Admission Registers, 1846-1921

Name: Mary Ann Davies
Gender: Female
Record Type: Admission
Admission Date: 22 Jan 1909
Institution: Hereford
Institution Place: Herefordshire, England
Death Date: 13 Jan 1941
Death Place: Herefordshire, England

1939 England and Wales Register

Name: Mary A Davies
Gender: Female
Marital Status: Married
Birth Date: 1873
Residence Date: 1939
Address: Hereford County & City Mental Hospital, Burghill, Hereford
Residence Place: Hereford, Herefordshire, England
Occupation: Incapacitated
Line Number: 8
Schedule Number: 2
Sub Schedule Number: 199
OVSPI: Patient
Enumeration District: Oggr
Borough: Hereford
Registration district: 337-2