The missing footage could be the section which is under investigation. If it is under investigation, they will not release that part to her or her defence team prior to any trial etc.
The 40 hours in custody - does this include the time she has been at the hospital? We can only hold people for 24 hours without extensions being applied for. The custody clock will stop if she has been at hospital whilst she is in custody.
Was she charged with anything or released on bail. I note that that an officer's glasses were knocked off at some stage?
It depends on what the risks are when she was brought into custody as to why she was strip searched. Has she made a threat of suicide or is there a marker on PNC or intelligence to suggest this. Is there a suggestion she has drugs concealed on her - I think cocaine was possibly mentioned in the link.
We have had in the past people who have died in police cells before by stuffing items such as toilet paper, clothing, socks, underwear down their throat - so if there is a risk there, that's why they have been removed.
She may remain handcuffed if there is a possibility she will become violent again when she awakes
We do it differently - we have cell watches for situations like this. So two officers will have to wait with her at the cell so she is under constant observations. CCTV on & BWV on. The downside to this is that it often makes the detained person more agitated as they are constantly watched, it drains all the police resources so we have no units free for burglaries, domestic etc. The local communities go mad when we are not attending jobs as we are all on cell watches.
Manchester may do it differently.