There is a death of Ann Matheson, other surname Cameron, aged 84, in Urray in 1860.
One death of Ann* M*t*s*n, other surname M*cLean, between 1855 and 1870: aged 88 in Duirinish.
No death of Ann* M*t*s*n aged 39 in 1860, or aged 59 in 1865.
No death of Ann* M*cLean aged 39 in 1860, or aged 59 in 1865.
There are some with no age listed, but none of them are in Ross and Cromarty.
So it does look as if there may be some problem with the inscription(s).
I think you can probably discount the various Coll*ston places, because generally speaking, whoever told the mason what to inscribe would expect people looking at the stone to know where the place is - if it's an obscure or distant place it would usually say where it is. But there's always the exception to the rule.