From this site's PRs; Gertrude was also born at Westbury Poor Union aka Workhouse.

Record_ID: 67058
Entry_Number: 193
Year: 1904
Month: Sep
Day: 26
Parents_Surname: WOOD
Child_Forenames: Gertrude
Fathers_Forenames: [base child]
Mothers_Forenames: Matilda
Mothers_Surname:
Residence: Union
Occupation: Unmarried Woman
Officiating_Minister: C Victor Stillingfleet Vicar
Event: Baptism
Memoranda:
Notes:
Register_Reference: P354 IN 1/18
Page_Number: 25
Parish_Chapel: Westbury on Severn
Soundex: W300

Presume the mother's name maybe a transcription error wrt Martha ?

I cannot find an obvious match for her future marriage or death, although this looks a "possible"

???

Marriages Jun 1923 (>99%)
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Luter James Wood Pontypool 11a 321
Wood Gertrude Luter Pontypool 11a 321