...and on SP there are 9 Jane M*cFarlan* s born in Renfrew between 1881 - 1883. But, I gather Whiteinch may not have been in Renfrew at that time:The only child born in Scotland is Jane McFarlane in Whiteinch, Renfrewshire, if census is correct she was 8 in 1891 so birth c.1883. I have been unable to find her birth in SP.
http://en.wikipedia.org/wiki/WhiteinchWhiteinch was at one stage part of the burgh of Partick, until that burgh's absorption into the expanding city of Glasgow in 1912, and part of the Parish of Govan.
I'm seeing no Jane M*cFarlan* s born in Govan during that period, but 3 were born in Partick over that same period, (2 of those in 1882 which seems like the most likely year), but you've maybe looked at these ones already and none are the correct Jane.
It certainly would seem worth chasing Jane's birth entry as this should give the date and place of marriage of the parents. (if they remembered and gave it accurately...but that's another story!)