PIP phone assessment/extreme distress at prospect

Hi please advise. I am the claimant's Mum. She lives 100 miles away. She is isolating/shielding, so are we. She rang today totally distraught having received a text out of the blue from DWP with an appt for telephone assessment Friday morning 5th June. Form was submitted on time end of Jan for reclaim upon old award [enhanced both gained at appeal second time running] ending.
We have never had her make me her official appointee as before we'd always been able to support in person. Doctors say there's no guarantee of getting a medical letter out quickly. Is there anything I can do to avoid her going through total torture and alone, please?

Hi, I have just spoken to IAS on the phone. Person said claim was looked at on 22nd May. So delay in sending text which arrived yesterday 28th. At least after checking daughter's address and that she knew I was calling he agreed to speak with me. I explained that even receiving the text had caused Overwhelming Psychological Distress to daughter. And she is waiting for a doctor's letter to confirm the assessment would cause harm ie Overwhelming Psychological Distress. I told him she is asking for a paper based assessment to be done. He said the person who looked at it had decided that a telephone assessment was required. [This even though there were 58 pages of evidence over and above the form]. I kept reiterating the distress issue but he did not budge.So then I said she would like the assessment deferred until the end of lockdown so I could support her. At this point I got the 'her claim will be referred back to DWP' line and he denied this was a threat. To be fair he had said they would arrange for a 3 way telephone call so I could support her but I told him quite truthfully this would not be enough, she needs me to be there. So I asked politely but firmly to speak to his manager as I did not think IAS would like the reputational damage of causing harm to a claimant. He claims they do not intend to cause harm to any claimant. He said he would email his manager to call me back and I can expect this within two working days.
Please, do claimants have any right to have a paper based assessment?

Hallelujah so far!! Discussed situation with experienced friend. He said write [recorded delivery as ever] to request recording. For this I need an address, daughter has not yet had letter. So I call IAS again. Get a lady with an indescribably more humane attitude. She even asks me about daughter's diagnosed conditions [7!] and how they affect her, and can she ring me back after speaking to a manager. When she does, they are going to ask a HP to look again to see if an assessment on the papers is possible or not [and if not what they will do instead]. It is now on daughter's record for no-one to phone her ever, including next Friday which is cancelled. She will be informed by letter of whether they are going to do the assessment on papers or what. If they need to write to eg GP for more info they will also inform her by letter! Talk about answered prayer.
So it would seem it is worth having a reason for ringing again if you need to. Lady did say that if daughter needed a recording they would send file back to DWP as it is DWP that asked for the assessment, and the assessors working from home do not have recording eq'pt.
Hope all this helps everyone else out there, " you may be by yourself but you are not alone"
Denby