I’m one of the information and advice officers from the learning disability helpline and I have a few suggestions that might help:
Has your daughter had an assessment from the disabled children’s team? This could be a way to access support for her as well as health care support. Details will be on your local authority website under disabled children’s services.
They may have a portage service, which provides home-based, early intervention and support for pre-school children: www.mencap.org.uk/portage
Your local authority will have a ‘local offer’ on their website. It will list all sorts of clubs and services available for children who have special needs and disabilities. This could be a way to meet other families in similar situations too.
There is information on the Mencap website here: www.mencap.org.uk/advice-and-support/children-and-young-people/education-support/support-parents-and-carers-children
Contact are another organisation who support families of children who have a disability: https://contact.org.uk/advice-and-support/
They have a booklet about developmental delay with lots of useful information: https://contact.org.uk/media/1200825/developmental_delay.pdf
I hope that helps,