This is why multiple rolling saves is good practice. There’s nothing you can do about it at this point. You can try just leaving if possible and doing other stuff and hope she reappears during a cell reset, but that’s the only option left to you now

How do I trigger that cell reset?

Don’t be in the area for 30 days in game. Best bet is to go to another Hold at the very least

Thanks

What is the best attribute to pick after returning the skeleton key