Flower Daisy is such a beautiful name, taking after her grandma with being called Flower.
It is so lovely that you get on with your DIL and such a shame about her own mother. My SIL to be lost his mum when he was 12 but I seem to have been pushed out of their lives, maybe because of this or not, don't know. But I thought that they would love to have some older adult to depend on fo both him and my DD but they seem to want to go it alone, after they have milked me for most of their nursery stuff though.
It sounds like they have to have no vests on to watch her breathing. She will be warm enough and I am sure they will fit her when she gets home and be thankful her grandma has such good ideas. Good luck to you all. Have they weighed her since? I will keep an eye on with interest. Lots of love.