Universal credit claim closed

Hi, sorry in advance for the long question .

My daughter is on universal credit and has been declared unfit for work and unfit to look for work. (She has severe anxiety, depression and autism) Her grandfather is her appointee as she isn't able to manage things like that alone. However, she was told that she had to go to the job centre to create a universal credit online account. We went in, they asked for certain things that we didn't have but forwarded on to them within their given time limit. They have told her that she needs to keep checking in on the UC website, though I made it very clear to them that she becomes extremely agitated and panicked when she is forced to do so. If she wasn't forced she wouldn't think to do it or would get scared of it, and would probably kill herself because she gets sanctioned.

She has had a couple of communications from the DWP, demanding that she send information to them that we already told them she didn't yet have, and a threat of sanctions along with it . When she read it, she was so terrified that if I hadn't been with her I believe she would have committed suicide. The DWP are aware of her disabilities and mental state .I replied on Beth's UC account that she isn't supposed to be receiving any communication from them due to her very fragile state and the risk involved, and that all communication should be with her appointee. We received a reply telling us that we need to enter her appointee's email address .We saw the request about a week later (her grandfather had a stroke in that time) so changed the email address. A week later my daughter saw a message on her UC messages saying that she failed to send information, and her claim has been closed .There was nothing asking for anything other than her grandfather's email address . No threat of sanctions if it wasn't provided soon enough, and no date that it had to be done by. This message was marked as being sent to us half an hour before we inputted her GFs email address, though now as her claim has been closed we cannot access her account at all. Might they have closed her claim after we gave the new email, but recorded the time as before? I don't know how we could have accessed her diary to change the email if her xlaim had already been closed.

Also, are they allowed to badger someone with serious and life threatening mental health problems when it has been on record that she has an appointee for her own safely? Are they allowed to sanction her because she didn't provide information even though they didn't tell her that it's sanctionable or that there was a time limit for her to input it onto the system? I daren't tell her that she has had her claim closed down, I'm so worried that she'll hurt herself. And I don't know where to even start with trying to speak to someone about it.

I would really appreciate some advice about what to do.
Thank you for reading my question