Hi Anne - now that I have been able to check my own information I have a couple of answers for you.
I believe you are correct with the baptism and parents of John Gilbart.
John son of James and Catherine GILBERT baptised 31st March 1760 at Phillack
John and Elizabeth seem to have followed a naming pattern.
The first two children were named John and Elizabeth and then came James and Catherine which we will take, for the moment, as being after John's parents.
That being the case then the next few children (Mary, Francis, Sarah etc.) should hopefully give us the names of the parents of Elizabeth Huthnance.
UNLESS - Elizabeth's parents were also named John and Elizabeth!
From IGI the only candidate seems to be:-
Elizabeth daughter of John and Elizabeth Huthnance bp. 8th August 1774 at Gwinear
That baptism is an almost perfect match for the burial of an Elizabeth Gilbart who was buried at St Erth 5th July 1847 age 73.
I believe this is probably John's wife although I have found some discrepancies in information.
John Gilbart was buried at St Erth 10th February 1837 and the OPC transcribed record shows that he was age
76.
However! - this event can also be found in the transcriptions from the West Briton dated Friday 10th February 1837.
John is described as having died 'on Sunday last' (5th) and that he was one of the proprietors of the Iron Battery Mills. He is also described as age
78.
In 1841 Elizabeth Gilbart was living at Battery Mill, St Erth along with children John, Thomazine, Margery, William, Thomas and Jane. Also in the household is Elizabeth Edwards, age 9, who I currently presume to have been her grandaughter.
Elizabeth's age was 65 which puts her birth probably sometime between 1771 and 1776.
(You won't find this Census record on Ancestry!
But you will find it in the Cornwall Online Census Project transcription.
Now let's have another look at the burial:-
Elizabeth Gilbart buried at St Erth 5th July 1847 age 73
The West Briton has the following entry in its edition of Friday 16th July 1847:-
At St Erth, on the 8th inst., Elizabeth, wife of Capt. John Gilbert, of St Erth, Ba.... Mills, aged 25? years
The age is obviously difficult to read, hence the ?, so it could be 75.
BUT - the record states that the death occurred on the
8th inst., which is 3 days after the above burial!
FreeBMD shows only one death recorded for an Elizabeth Gilbert/Gilbart in the September Qtr of 1847 in the Penzance R.D.
And the transcription of St Erth burials also shows only one Elizabeth buried in that time period which leads to the conclusion that the above burial and the entry from the West Briton must be for the same person.
Question - which of the two is in error?
BTW - James Gilbert married Catherine Pearce 16th April 1752 at Gwinear
CT