Around 10-11 years ago I interviewed at Epic and I also had a friend who worked there. They have great benefits and a really neat workplace (google-like in that they have themed buildings and even a treehouse for meetings) but I remember that there was not very good opportunities for advancement. It seemed like a really great launch job, but the structure was flat within the organization, which is probably why the salaries look on the low side. It may have changed significantly from what I remember, but that is something to keep in mind, or for her to ask in the next round of interviews about advancement opportunities. I think back then starting salaries were in the low to mid 40ks, but I'm not sure because it varied by position type, I was interviewing for technical writer.
The interview process might be completely different, but they split off people for the different jobs and had a lot of odd interview tasks. For the writing position they gave me a few timed writing exercises to complete (4 or 5 things, I distinctly remember being asked to write some lines from my favorite poem in addition to writing a few fake articles on topics and myself), and the interview questions were strange. I particularly remember being asked "what are three things you are not?" and being quite thrown off by the question as it was my first interview.