Well I am actually in the same shoes as your sister. I have been checking the internet for new and refurbished computers, and I am spoilt for choice. The refurbished computers have a very tempting price, but they say if a deal is too good, one should think twice. The new ones, give the confidence of operational stability, but the price is off the hook. As for me, I would suggest that it depends with what she wants to do. If it's basic browsing, or working with word, excel and PowerPoint, then a refurbished one is okay. Anything beyond that, requires a better and if possible the latest version of operational machine.