Others mentions about Olga's illness and about arsenic, from Chebotareva's diary for 1915:
"19 of october, they came back... They got a cold. Olga has caught, her nerves are strongly destroyed (silno rashatalis), she became very thin, is white. She help not for doing pansements, she can not see any wound, the operation room. It is terrible for her, she is trying, can not, is nervous, but can not fight herself... How sad it is to see the poor Girl, she is so sad, so nervous! People say, she is too tired.
24 of october: Poor ON is totally ill, she has a strong anemy, she is liying for a week, but is allowed to come to the lazaret 30 minutes in the day to get arsenic.
Sorry for the bad translation