our tenant had a baby weighing only 1lb. in November. She is bringing it home in the next with oxygen. She is being taught how to manage and operate the oxygen canister. She has a fire blanket. What else does she need to know

Oxygen is not flammable but a rich oxygen atmosphere will assist combustion, so items do not burn normally, but will burn rapidly, so fire prevention is very important. Never smoke or take ignition sources within the area, oxygen is being used and study the guidance to inside the home, found on https://www.gov.uk/government/collections/fire-safety-guidance#fire-safety-guidance-for-inside-and-outside-the-home