I've had this happen before to my industrial. I accidentally got some bleach in it and it got a little swollen and painful to touch.
First of all, your friend should definitely keep some good quality jewelry (no acrylic or organics) in the hole so it doesn't close up and end up with an infection inside it. The sea salt soaks should be helping. When this happened to me, I did a few sea salt soaks and used tea tree oil, which some love and some swear against it, but it works great for me. Took care of the irritation within no time at all, and soon enough my industrial was back up to par. I've never used vitamin E oil, so I can't tell you whether or not that'd be a good idea.
It'll probably take up to a week of sea salt soaks to clear the piercing free of any chemicals left behind. If the irritation and swelling continues past that, your friend should consider going to her piercer or doctor and getting it taken a look at.