Actually, I do want DD to be worried about money when it comes to large sums. As I said, I was brought up to believe we were hard up, but at the same time, we had various luxuries that I simply assumed 'everyone' could afford - o even, I assumed they were the 'poor' version of what most people had.
I want DD to worry a little, absolutely! I do not want to raise a spoilt child who thinks 'mummy can afford everything!' I want her to be able to think 'hmm ... perhaps there are limits in life'.
It is really healthy for children to feel some responsibility, and to see a direct connection between what we adults are doing, and what we say is going to happen for them. If I say 'DD, we can't go to Disneyland Florida,' I want DD to understand that is because we cannot afford it. It's not a whim of mine, because I disapprove or because I don't like the idea. If it were those things, I would tell her so.
I would never let her feel worried about how we afford food or heating or school uniform. But I certainly do want to let her understand that you might worry about money for luxuries, and you might end up realising you can't afford everything you would like.