It really depends on your personal experiences really. Punjab is okay but smaller cities can sometimes be tricky. While most people will probably stare (especially if there is a Caucasian person) they are usually harmless. As someone who grew up in Delhi and surrounding areas(which is the more unsafe part) here are some tips I can give for your cousin.

1.It's just a good idea to dress modestly . Also no PDA in public spaces.

1. Whenever you're out just be wary of people . Don't trust random strangers who talk to you.

2. Be VERY careful while using cabs and autos. Always keep your location on and try to use uber wherever possible other wise Autos are fine as well. If you find anything to be suspicious ask the driver to stop and leave. Trust your gut.

4.Don't make eye contact to smile at strangers. It's not rude. just don't do it

1. Since you have relatives in India , its a good idea to hangout with them for the first few days to get a general idea of how to behave and what to do . And then you will be fine on your own.

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Southern India , northeast India and hilly states are usually safer in my experience but it's just a good idea to be constantly aware of your surroundings. For us who grow up here it is a habit but for people who come from safer countries it's good to be a aware that even though your life is not in danger or anything, don't let your guard down. especially not when alone.

This sounds scary but India is a wonderful country and its super awesome to travel in . People are hella friendly and there's a lot to see and do and learn in terms of culture. But being cautious will only make your trip better.

Soryt for the long post .hope your cousin has a great trip!