I think I am missing information. Are you talking about a photocopied bible that you need to cover?
I know how to bind books, but this kind of bookbinding requires equipment worth $1,000.s. My wife has optic neuritis and needs a large print bible. We found several through Family Christian Books (a book chain). The other option is bible software that allows you to increase the font size on a monitoIf either of these options would suit your needs better, let me know the kind of vision problems she has and what version she prefers and I will try to find something for her.
As for binding, you might consider a 3 hole punch and a notebook binder as an alternative to costly binding. Tell me what size the finished pages are going to be and how many pages ( how thick) the finished book will be. There are book binders that provide the service, but again it is very costly. Usually, they are repairing a bound book rether than doing a new binding.