We have now received the AOS (affidavit of Support) billing for $70, dated February 4th but obviously delayed somewhere. In addition we have received a copy of the notice of the choice of agent and address form that they sent to my daughter (she received it at the same time).
We have now got a visa case number for my daughter which is a comforting thing. Now we have to wait for the I-864 instructions.
I will keep you updated.