Problem accessing "First account"/Data with Monterey

Hello,

My girlfriend Mac Air was booting but unable to log in (blocked on the loading bar with a apple logo and black screen behind)

I was able to pass this bug by using safe mode.

I googled a bit and saw that I can update the Mac with cmd + r (or something like that) to get the latest mac update, I did it.

After the update, i logged on her session, same problem, forced me to use safe mode.

I used safe mode and now, mac monterry is asking me to create a session, i did it hoping the data would still be here, and unfortunately it's not the case.

So to sum up, i now have a mac, with 2 log in required, the first one being the original session with the data im looking for (this login wont pass unless i use safe mode), which then redirect me on the second log in, which must be Monterey.

I'm looking to access the first session data, i think it's still here according to the disk usage, but can you confirm installing the most recent update with cmd + r (or something like that) don't erase the data ?

And do you think i can do something to access that data ?

(i'm not looking to fix the mac yet, only trying to get that data in a safe place)

Thank you for reading and sorry for my english.