Autism financial and other help

New in here however I dont know if anyones in similar situation or knows anything.

Family we have mutiple kids with Autism of diff ages and different types but we have 2 older niece 18 and another family member 30.

Our issue is she has autism, never offered help like many people suffering, she struggles, v short attention this includes food...cooking and if not written down forgets or mind is off it, not good with communication what-so ever, blunt....like many lots of symptoms, we did try get her working just to have a go...it was only ok when her sister worked with her and guided her through everything every shift, but when her sister left she couldn't cope freaked. Loneliness and depression followed. Anyway what am wondering if anyones had support issues like ESA and so on? She did but no help, but literally they called a surprise visit, went and oh your fine on job seekers, no help, well call you. Then after appropriate adult....so family member listening to them explain, she would go on universal credit but on the same rate but now nope, shes gonna go get rereviewd and may have to find a job....they dont seem to care whatsoever. Theres not much we can do at the moment but does anymore know who to ask or had similar issues or advise anything please.