I've looked at both sets of parents you give for a Margaret Callow, Sue:

Margaret daur of William Callow/Cath Kerruish bapt 27 Jun 1830?
Margaret Illegitimate daur of William Callow/Mary Corkill bapt 2 Jul 1837?

William Callow & Catherine Kerruish married Maughold 16 Mar 1822
William Callow & Mary Corkill married Maughold 11 Sep 1837

The William married to Cath Kerruish was a farmer.

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These are the children of Wm Callow/Mary Corkill:

1. ANN CALLOW - International Genealogical Index
Gender: Female Christening: 16 SEP 1846 Maughold, Isle Of Man, England

2. MARGT CORKILL - International Genealogical Index
Gender: Female Christening: 02 JUL 1837 Maughold, Isle Of Man, England

3. WILLIAM CALLOW - International Genealogical Index
Gender: Male Christening: 24 MAR 1844 Maughold, Isle Of Man, England

4. ELINOR CALLOW - International Genealogical Index
Gender: Female Christening: 11 MAR 1849 Maughold, Isle Of Man, England

5. JANE CALOW - International Genealogical Index
Gender: Female Christening: 09 JAN 1842 Maughold, Isle Of Man, England

6. MARY CALLOW - International Genealogical Index
Gender: Female Christening: 06 JUN 1839 Maughold, Isle Of Man, England

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also (mother Mary/no surname):

10. REBECCA ESTHER CALLOW - International Genealogical Index
Gender: Female Christening: 03 AUG 1851 Maughold, Isle Of Man, England

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CALLOW Margaret 4 Maughold 1464/7 23 12

1841--Ancestry's transcription:

Maughold 2/6

Name Age
William Callon 20
Mary Callon 30
Margaret Callon 4
Mary Callon 2

William is a tailor !

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1871
Maughold 1a/5

Also at Ballafayle, next dwelling to Margaret Corkill nee Callow, are Mgt's parents?

Willm Callow head mar 56 labourer
Mary wife 62
Esther dau unm 20 gen serv
Ann Jane "dau" 6 scholar
all b Maughold

William could have been forced to give up his work as a tailor due to ageing eyesight ?
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This could be Ann Jane age 6 in 1871 ---- IGI has "mother Mary Callow, no father's name"

1. ANN JANE CALLOW - International Genealogical Index
Gender: Female Christening: 14 SEP 1864 Maughold, Isle Of Man, England

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Jean C