I don't think the blisters is luck really, she has been suffering from them a few times this season. We have to remember that her body is not used to the rigours of the professional tour yet, it will take time for her to get used to it not just mentally, but also physically. Remember her matches this week were her first ever on clay at the top level, which just sounds crazy. She doesn't even really know how to move on the surface, it is a huge learning curve.
I'm confident we will see her back up near the top, and I'm sure she is capable of being a top 10 player and challenging regularly for slams... but what she needs now is time. It may be a year or two before we start to see her potential in anything other than brief flashes.