Dear Sriram,
This is in addition to what Shri Nathrao has said. If your friend is changing her job every two years, then she could be the luckiest person. Getting a job in HR is difficult. I have seen HR professionals trying for better opportunities for years together but in vain. In contrast, if she gets a job without being perceived as a job-hopper, then it is her good luck.
If your friend has changed her job every two years and in the interview, if she is being asked why she did that, then you may tell her that in the interview, she needs to highlight the benefits, especially non-financial ones, of the job change. Secondly, she should mention what new things she learned in each job or how she grew because of the change. Lastly, if she can explain how changing jobs helped her achieve her career objectives, that would be even better.
Thanks,
[Dinesh Divekar]