Detaching is a process - I don't think you did anything horrible, especially if W was engaging in the conversation.
I would leave the weight loss thing alone now though - telling her once is one thing, but going on about it might seem like an attempt to impress her or something. I especially can't see how the diabetes thing could hurt - to me that is showing W that she has some value, and is worth something. Might seem really piddly and small, but those will add up.
Again, detaching is sort of like peeling off a sticker. You have to go slow, and pull firmly or it'll just tear, and then you have to pick at it, and it'll take forever, and leave a sticky residue.
So, take it easy - keep strong, let W soak awhile. Don't call her or talk to her at all tomorrow now!
