LPA and Court Protection Order Advice Needed

My elderly mother is becoming increasingly forgetful and I'm worried about her ability to manage her finances and healthcare decisions. I'd like to set up a Lasting Power of Attorney while she still has capacity, but I also want to understand what court protection options exist if things deteriorate further. I need clear guidance on the LPA process, what documents are required, and when court involvement might become necessary. I'm based in England and want to move quickly but sensibly.