Hip replacement - questions

Hi
My Mum is going into hospital later today for a pre-operation check-up in readiness for a hip replacement, and I had been told that once that was completed we could expect a wait of approx. 14 days.
However, they have asked me to take all of her current medication, to the hospital with me, for the check up.

Does that seem a bit strange to anybody else? Is that standard practice?
I am worried in case they want to keep her in and do it there and then, as she wouldn't understand, and that would be very frightening for her.

Also I am worried about the anaesthetic, as she takes many different medications, including those for epilepsy and high blood pressure. She has had 2 major strokes and 46 minor brain haemorrages, and I am wondering if these issues will increase the danger of going under anaesthetic?

Clueless and concerned
s