>>1051157>easy route>abseiling>assisted braking belay deviceI understand your concern. But don't you think that is a bit excessive? Belaying (both lead and toprope) aren't difficult procedures.
If you are that concerned, I recommend you get a Wildcountry Revo. It is a fully automatic belay device and literally unfuckable. She can let go and nothing could ever happen.
Just a thought.