I note that FS tells you everything about the obit except the most important detail, that is, which newspaper it was printed in.
It's in the Aberdeen Press and Journal on 20 (NOT, as FS says, 21) April 1936. Also it is not an obituary, just a death/funeral notice.
McIRVINE.—At Guildford, Surrey (suddenly), on 17th April, 1936, Catherine Lumsden Davidson, aged years, widow of William Mclrvine, Mauritius Colonial Service. Funeral Allenvale Cemetery, Aberdeen, on Tuesday, 21st inst., at 11-45 forenoon. Friends please accept this (the only) intimation ...
FreeBMD gives her age at death as 63.
The calendar of probate says, "Davidson or McIrvine, Catherine Lumsden of Oakdale Winter Hill Guildford widow died 17 April 1936. Confirmation of Edmond Sinclair solicitor. Sealed London 20 July".
This means that her estate was dealt with in Scotland. There is no such thing as probate in Scotland; the corresponding process is called Confirmation. A Scottish Confirmation is sealed in the English courts if the deceased had property in England, and an English probate is sealed in the Scottish courts if the deceased had property in Scotland.
Also her surname is listed in the Scottish form 'Davidson or McIrvine'. This makes it instantly clear that Davidson was her maiden surname and McIrvine her husband's surname. Fortunately for family historians, a married woman does not lose her maiden surname on marriage in Scotland, and in legal documents she is always referred to as xxx yyy or zzz, where xxx is her given name(s), yyy is her maiden surname and zzz her husband's surname.
