iPhone 12 is bricked after impact, how to determine point of failure?

So to cut a long story short a relative has managed to slam her phone in the boot of her car and immediately afterwards it was completely dead. She's not too bothered about the phone but is desperate to get some very sentimentally valuable pics off the drive. Let this be a reminder about the importance of backing up!

I am essentially trying to get the phone into a state where the data can be retrieved, sorry for the long post but I want to run through what I've tried so far to see if anybody has any suggestions, pics below.

My first thought was perhaps only the screen was broken but this now seems unlikely, all cables were intact so I would have expected at least something to display, even just some artifacting. There is also no response when plugging the device into a computer, no vibration or noise as you would normally expect and also no recognition from the computer a device has been connected.

My second thought was perhaps a damaged battery or logic board but both of these appear fully intact and undamaged, my concern is there could potentially be non-visible damage on the board, though from the location of the damage it should have been spared the impact. There were also no disconnected or loose ribbon cables so I don't believe that is the issue.

As you can see from the pics the area of the damage was right around the lightning port, haptic unit, and microphone. These all look okay but even if they are damaged I can't see why that would brick the phone, unless there is potentially a short-circuit issue or safety trip that would cause it?

Obviously I can start buying new parts (new frame with the potentially damaged components can be had for £60 + screen for around £30) but I'm not sure this would be wise considering the board could be the issue. If the board is the problem then I imagine I would need a micro soldering specialist which is obviously a last resort due to cost.

I know this post basically amounts to asking for a guess but hoping somebody with some more experience can point out an obvious explanation?