Is this Mrs Beech? Looking at the census entries (particularly the most recent available) I am convinced that the name is Annaus, not Annans.
You're quite right, it is. On the 1911 census Ancestry have transcribed it as 'Annaus' (I find it difficult to say which is correct by the handwriting by her husband when looking at the actual image), and JenB is also correct in that the GRO index image for the marriage (typewritten) definitely shows 'Annans', but this could be a mistranscription.
Thanks for the death record info giggsycat - that is obviously her, which leads me to the conclusion that it should be 'Annaus' - but 'Annans' or 'Annaus', either is very unusual not something I've come across before.
No luck when I Google it, either!