As my original message said, I found this birth record on Scottish People, and there's only 1 recorded birth across all parish records of a 'Grace' between 1815 and 1816.
Just put that one on a mental shelf for the moment. It's highly unlikely to be the right Grace if she was born in Glasgow, although it's not impossible.
All other information I have for her was obtained from census records and birth / death records for her children (I've check 1841 through to 1861 census records, and have identified that she died in 1865). She seems to have moved from Whitburn to Gateshead by 1838 as she has her first child Mary Dick (B 1838 - Durham) at this point and appears to also be married to Joseph Dick (B 1813 - Durham). I guess my next step is getting hold of one of her children's birth certificates to see if her maiden name is on there .... I was just hoping I could find something online first.
I presume that what you found is the 1851 census showing Joseph, 38; Grace, 36; Mary, 13; Grace, 8; Catherine, 3 and Abigail, 1 at Whickham, Gateshead. The original is very faint, but I agree with the transcription of Grace senior's birthplace. You are very lucky, because it ought just to have said 'Scotland' so the enumerator should not have written 'Whitburn' in his book at all!
The International Genealogical Index at
www.familysearch.org has a 'contributed' listing of the marriage of Joseph Dick to Grace Gullan in Edinburgh St Cuthberts on 4 January 1836. As it is 'contributed' rather than 'indexed' and it says that it was a 'patron submission' I wouldn't trust it unless and until I've seen the original document from which it was taken, though since they have
upgraded mucked about with the Family Search web site it is all but impossible to track down the sources of 'submitted' listings, more's the pity. Ignore dates of birth listed in the IGI, they are just guesses based on the erroneous idea that a man is aged 25 and a woman 21 when they marry.
If you get one of the children's birth certificates I think it will tell you her former (i.e. maiden) name, but I'm never quite sure what English certificates do contain. I see that Abigail's birth was registered in the Gateshead registration district, and that the registers are now held by The Register Office, Civic Centre, Regent Street, Gateshead NE8 1HH, telephone 0191 433 3000, e-mail
registeroffice@gateshead.gov.uk, web site
http://online.gateshead.gov.uk/bmd/ - you could try an e-mail to them asking specifically if the maiden surname of Abigail's mother is Gullan or similar. Their reply will tell you if the (slightly dubious) Edinburgh marriage is the right one.