Any suggestions for hip replacement/blocked artery

My mother has been talking about a hip replacement for a few weeks now. She decided to do it, but in the process of getting her pre surgical physical, they discovered a mostly blocked artery. She has that procedure scheduled in a week or so. In your books and on this site, change of diet is the biggest factor in clearing the veins and arteries. How fast does this work? Would it be viable for her to try it and put of the procedure for a while? Also do you think that following the whole program might allow her hip to get better. I have read some of the literature on hip replacement, and I'm not too positive about it. She is almost 80.

Thanks, I really appreciate this forum and all the great information you share here and in your books.

julia