Apparently, this is 2 sentences of 14 days to run concurrently for charges relating to a previous case where she refused to pay, and 2 sentences of 7 days to run concurrently for later charges. Both relate to criminal damage to military establishments.
She is in Bronzefield Prison in Middlesex. You can write to her there, but it is unlikely that she will be able to organise visitors passes in the time available. She will be eligible for release in 10 days, probably. Details are:
Tel: 01784 425690
Fax: 01784 425691