Young Mister Lestrange,
Unfortunately, I write to inform you that Narcissa's health has not done much to improve and I therefore must cancel her little event or anything else she might have planned.
Should I decide to send my daughter back to Hogwarts, I will imagine it will be at a much later date than the norm. I've sent owls to the people who should be informed, but my knowledge on the efficency of the school is somewhat lacking at best - judging from other reports, however, I imagine that it is notas good as it should be. Therefore, I request that you simply feed this information back to any professors or students that might ask.