Hedr birth index:

Surname   First name(s)      District   Vol  Page
Births Jun 1886   (>99%)
MARTIN Kathleen May Axminster 5b 5
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Might this be her marriage?

Surname   First name(s)   Spouse   District   Vol  Page
Marriages Sep 1912   (>99%)
Martin Kathleen M [H_]earle Newton A. 5b 239

and from the Devon Banns register:

First name(s) Kathleen May
Last name Martin
Banns year 1912
Banns date ? ? 1912
Marriage year 1912
Marriage date 10 Sep 1912
Parish East Teignmouth
Spouse's first name Nathaniel Salmon
Spouse's last name Hearle
Residence East Teignmouth St Michael
Spouse's residence St Mary Magdalene Richmond Surrey
County Devon
Denomination Anglican
Country England
Archive South West Heritage Trust
Archive reference 3231A/PR/1/17
Record set Devon Banns Registers 1538-1915
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And this very mush looks like their children:

Surname   First name(s)   Mother   District   Vol  Page
Births Sep 1913   (>99%)
Hearle Kathleen A Martin Richmond S. 2a 1006
Births Mar 1915   (>99%)
Hearle Nathaniel M Martin Richmond S. 2a 959
Births Dec 1924   (>99%)
Hearle Audrey    Martin Richmond S. 2a 757

At the last birth Kathleen May would have been 38.  Sounds OK.
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Her death:

First name(s)   KATHLEEN MAY
Last name HEARLE
Gender Female
Birth day 14
Birth month 4
Birth year 1886
Age -
Death quarter 2
Death year 1973
District MALVERN
County Worcestershire
Volume 9D
Page 533
Country England
Record set England & Wales deaths 1837-2007
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Their marriage index:

Surname   First name(s)   Spouse   District   Vol  Page
Marriages Sep 1912   (>99%)
Hearle Nathaniel S Martin    Newton A. 5b 239
Martin Kathleen M [H_]earle Newton A. 5b 239
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