Is your house owned or rented?
You may already know this as I know your DD is older than my DS but I have a sort of ranting thread on here where I have posted about things to help as I have finally found out about them.
There's a few things on there to help you save money like cold weather payments, warmfront grant, council tax reduction, some water and energy suppliers offer lower tariffs, free bus pass, discounted rail pass and free road tax. There are also various charities that give money to families in need such as Family Fund, The William Cadbury Trust, The Kensington Foundation, The Esmée Fairbairn Foundation and The Frank Buttle Trust.
Some also do holidays and repsite breaks like The Kensington Foundation and The Daisy Chain Project and the National Association of Toy Libraries will tell you about any local or mobile toy libraries near you.
You may know about all or some of these, but accessing these services has made money available for other things.
This is the thread, it is on the SN topic but those charities I mentioned help low income families with NT children as well apart from Family Fund, Daisy Chain and The Kensington Foundation.