1911 Census help please

[Rocky1]

I'm having trouble finding Elizabeth Allan Miller on the 1911 census.
Her d.o.b is 29 December  1874 in Old Monkland
Father: Robert Wallace Miller and Mother: Mary Allan.   
Elizabeth gave birth to a son John, October 1905 in Glasgow.   
Thankyou to anyone who can help.

[sancti]

Who, when and where did she marry?

[Rocky1]

Hi Sancti,
Unfortunately there's no information of a marriage for Elizabeth, however there was 'talk' in the family that she did marry but that was all.
If there was a marriage it would have been after the birth of her son
5th Oct. 1905.  No father's name was written on the legal birth registration  only the word 'illigitimate'. Elizabeth gave her occupation as a domestic servant.  The address shown on the birth registration is 63 Ashton Lane, Glasgow.   

[sancti]

Have you found John on the 1911 census?

[Rocky1]

Hi Sancti,

Yes, I  have John's birth certificate but can't locate his mother Elizabeth Allan Miller. 

[sancti]

Where was John living on the 1911 census

Could his mother be dead by then?

[Rocky1]

Hi Sancti,

Elizabeth's son John was born in 1905 at 63 Ashton Lane, Glasgow,  so this would make his mother's age then about 31 yrs.
There's so many Elizabeth Millers on the 1911 census, but no Elizabeth Allan Miller's that I can find.   Perhaps she married and changed her name.

Thanks for your help Sancti