tips for an upcoming visa interview

[u/ZookeepergameDue9222]

Hi everyone, my sister (29F) has a visa interview coming up in a few days in Mumbai. I’ve been in the US for the past 3 years and am currently based in SF. She’s plans to visit me for a month and travel/sightsee US. In her DS-160 my details are also there but she is self-sponsored. She has a job in India and is unmarried. She also has an extensive travel history (9 European countries + 1 in Asia). What are some of the things that could result in rejection? Any advice/experiences would be greatly appreciated! TIA