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I was looking in 1871 too for the little girl to see who she was with but no luck.  Bit of an odd one isn't it.

When did she marry someone else?

I have her in 1871, married with children, think she married in 1868 to a Barrett. 
I'm starting to think the marriage just didn't happen for whatever reason.  The banns are in a Church of England church and I know they were roman catholic.  Mixed faith marriages did happen obviously, but it was rare (from my experience in family history) for the catholic to go to CofE, especially when it was a female. 

I suppose it could be the surnames were transposed, I'm trying to find the actual marriage register for the church, not just the banns to see if I can find anything more. 
Or perhaps the wedding never took place. 
Could it be that they were read in another church too in a different parish (or faith?)
Thanks to all who have replied

Hi, I wonder if anyone can help me.  My mum had 3 children before she married their father.  My half brothers were born 1961, 1962 and 1963.  The ones born in 1961 and 1963 have to birth registrations but not the middle one.  Can anyone shed light on this? 
My mum married their dad around 7 or 8 weeks after the last baby was born.
TIA

Some questions

1 The sibling that contacted you, did they have roughly an 1800cM match to you?

2 Are they unsure of their actual parentage?

3 What is the half sibling’s cM match with the other half sibling?

4 What is your cM match with the other half sibling?

5 Do they have any other full or half siblings or first cousins who have been or will take a DNA test?

6 Does any of the Shared Matches between you and your half sibling give any clues?

the sibling that contacted me has 1909cM shared with me and just over 1700 cM with the other half sibling.  I share 1435 with the other potential half sibling.
The sibling I'm in contact with grew up with rumours that the person who is down as his birth father isn't his birth father and is just awaiting full confirmation of this, but it's 99% certain the named father isn't the correct one.
Both my brother and the half sibling's brother have done tests and we are awaiting confirmation of the results, but neither I or my half sibling match any person from the parental line that we grew up with. 
We are in touch with a few distant cousins who are trying to help us, however they don't have much information.  Others who we have contacted don't know anything at all the potential half sibling we're searching for.

The date on this extract is 4 Mar 1914, but if you look at the GRO indexes via FreeBMD (or the indexes at Lancashire BMD) you'll see that the marriage at St Peter's was registered in Dec qtr 1913. There is no civil registration corresponding to the 1914 ceremony.

I'm not an expert on RC marriages, but it seems that the official legal marriage took place in 1913 in a non-RC church (note "Mix. Matr." - 'mixed marriage'), and it was decided that there should be a further ceremony in an RC church in order to comply with their doctrine.

Thanks, it was the Mix Matr I was interested in as I'd not seen it before in other mixed marriage documentation before.  I believe in the Roman Catholic Church you aren't considered married unless the marriage took place in a Catholic church.  I suppose this would explain the 2nd marriage.