Bubbles your first hurdle is getting the LA to agree to assess. Focus on that first. You don't need to worry about asking for provision in the EHCP just yet. As part of the EHCNA must seek advice from:
"a) the child's parents or the young person;
b) educational advice (usually from the head teacher or principal);
c) medical advice and information from a health care professional;
d) psychological advice and information from an educational psychologist;
e) advice and information in relation to social care;
f) advice and information from any other person the local authority thinks appropriate;
g) where the child or young person is in or beyond year 9, advice and information in relation to provision to assist the child or young person in preparation for adulthood and independent living; and
h) advice and information from any person the child's parent or young person reasonably requests that the local authority seek advice from."
SEN regs 6(1)
For someone with DD's needs I would suggest H should include SALT, OT, psychiatrist &/or CP, at least. Even if DD currently sees these you need a report written specifically for the EHCNA. Provision in EHCPs is taken from the reports, therefore if the reports aren't detailed, specific and quantified the EHCP won't be either, then it isn't worth the paper it is written on. The report should highlight DD's needs and what provision she requires.
Anything that "educates or trains", including therapies, should be in section F of the EHCP, and therefore the LA are ultimately responsible for ensuring it is provided, even if the NHS deliver it. This is vitally important because then it is appealable and enforceable. If the NHS can't or won't provide it the LA must commission independent providers. It allows a greater range of therapies without the need to sit on waiting lists, at a greater frequency and for a longer length of time.
For someone with DD's needs I would expect at least OT (including sensory OT), social skills interventions, SALT, ELSA, independent daily living skills and some kind of therapeutic MH therapies.
Education wise - what about specialist software and assistive technology, touch typing programme? Does DD need a 1:1 or mentor to keep her on track/help with planning/organisation? Is online schooling with other pupils going to work? Or would either F2F or online 1:1 tutoring meet DD's needs better?
You could make a good case for some kind of exercise (DS1 has swimming, rebound therapy, physiotherapy that is delivered partially by a specialist physio and partially by a specialist personal trainer). I know others have secured horse riding, climbing, specialist PE teacher, football, kayaking, gym membership and equipment. Someone on MN has a chef delivering cookery lessons. I know someone who has funding for the Arts Award.
Other provision I know of includes a Care Farm, funding for an extracurricular book club and an extracurricular coding club.
The good thing about an EOTAS package is it is unique to the child depending on their needs.