Who was Ellen Robinson and what became of her?

[Ladyhawk]

There is another George & Mary Robinson on 1851 census - no children

1851c Piece 2052 Folio   186 Page number   46
Gas Street Birmingham      
George Robinson 35 Head occ labourer   
Mary Robinson      21   Wife
James Watkin 42 Visitor
The above George Robinson pob Dudley Worcester and Mary’s pob is dittoed Dudley Worcester
1851c https://www.familysearch.org/ark:/61903/1:1:SGZN-DVP?lang=en

[littleem1906]

@Ladyhawk Thank you so much for looking into this.

On the 1861 census it appears that the ages of George and Mary were written in the wrong place. So the 29 crossed out next to Ellen should have been Mary's age above. I do believe this Ellen was indeed aged 7.

In which case, she couldn't be my Ellen who married in 1868. I doubt she'd have been able to marry at 14? She was apparently 17 at the time of her marriage to John...unless she lied about her age. But why? And was this even possible? She isn't listed as having an occupation on her marriage record, but that might not be uncommon.

IF the Ellen in 1861 is my Ellen, then she would have been born around 1854.

(As an aside, the only Ellen Robinson I could find with MMN Wright was an Ellen Wright Robinson born in King's Lynn in 1848.)

There is an Ellen Mary Robinson born in Birmingham in 1852 - MMN Bosward.

This is a real conundrum. It makes sense that the family in 1861 to be the correct one, because of the father's name George and the Mary living with them. I just can't understand the age given for Ellen. If she really was 7 in 1861 and she is the one who married John Richmond then she must have been underage when she married. However, if she WAS 17 at the time of marriage (making her age in the 1871 census correct) then this family cannot be the right one.

[littleem1906]

There is another George & Mary Robinson on 1851 census - no children

1851c Piece 2052 Folio   186 Page number   46
Gas Street Birmingham      
George Robinson 35 Head occ labourer   
Mary Robinson      21   Wife
James Watkin 42 Visitor
The above George Robinson pob Dudley Worcester and Mary’s pob is dittoed Dudley Worcester
1851c https://www.familysearch.org/ark:/61903/1:1:SGZN-DVP?lang=en

This census could be the same family as in 1861? Though the birth place for George is different.
 If so, this is what made me question whether the above George is the correct one, because my Ellen Robinson was apparently born in 1850. Therefore she'd surely appear on this census. Unless, as I said, the Ellen in 1861 really is my Ellen and she was born later than claimed on her marriage certificate and in the 1871 census. In the 1871 census she was living with her husband John's parents so they may not have known her real age perhaps? 

Which then brings me back to the question - where is her birth registration on GRO?

Given the age gap between George and Mary, I do think there's a chance he was married before. If so, Ellen may have had a different mother, or she could be the illegitimate child of Mary Wright.

[Milliepede]

She isn't listed as having an occupation on her marriage record, but that might not be uncommon.

Just a comment on that, it was far more uncommon for a woman to be listed with an occupation in those days than not whatever her age. 

Also I believe full age for marriage was 21.