She'll be part of a group of girls and it sounds like they'll be working 6 days a week, getting ferried around to various events. She thinks the job will be based in Hyderabad which seems to have a reputation for being one of the safer cities in India for young women (although the latest email mentioned Mumbai so it is one of the things she's checking) but knows she'll need to be careful over there. She's pretty sensible and not one for going out partying etc.
I don't think partying is the issue. These are the things I would recommend considering:
1. Chaos. It is highly likely that everything will be poorly organised. She has already experienced a question over whether it is Mumbai or Hyderabad and she is being asked to agree in one day. Things won't improve. At it's worst there may be considerable over promising going on and the reality will be quite different from what she thinks she is getting. To survive all this, she needs to lower expectations and try to embrace the chaos.
2. Pollution, poverty and dirt. There's lots of it, and some people struggle.
3. It's less of a problem in big cities, but she'll be assumed to be wealthy and, therefore will need to look out for constant rip-offs.
4. Sexual harassment. This is the big one. She's likely to be groped and attract a lot of attention. That's manageable for some as a tourist, but when working there, what's the plan when some big chief thinks he should sleep with a dancer? I would really want to understand what level of protection they at least say there is on this front, because I don't think the police is the solution.
The best thing for her to do would be to try and talk to an existing foreign dancer to see what life is really like.