Not really an answer, but rather a frame challenge.
I don’t know of any visitor visa which would exclude unemployed people. Otherwise students, retired people, housewives and children could never get one.
What matters for immigration officers is that:
- You’re not a danger to national security (read: a terrorist or other criminal)
- You have the means to support yourself during your stay and won’t need to work or be supported by the public purse. Being employed is one way to prove that, but having enough savings is also a way to do that.
- That you will leave the country within the time allowed by your visa, which is usually judged by “strong ties to your home country”. Again, having a good paying job can be part of proving it, but that’s definitely not the only way to do that either.
People like her are actually what most countries want most: people willing to spend a lot of money in hotels, restaurants, shops and activities. They definitely don’t want to close the door to her, and some have special premium services for the richer people.
If she actually has any trouble trying to get a visa she should hire a real immigration lawyer, not implement some ludicrous plan (she’s right on that).
I’ll still add a few points regarding the original question:
- While some documents like bank statements (which should here include any account statements showing her available funds, not just her current account) will need to be provided, she does not need to provide pay slips if she doesn’t say she earns a salary.
- Consular officers see dozens if not hundreds of those documents a day. They can probably pick a fake a mile away.
- The most common issue with fake documents is lack of consistency. Again, consular officers see lots of those every day and are well trained to detect any inconsistencies.
- If they detect any fake documents, not only will the application be rejected, but she can be blacklisted for a period sometimes going up to 10 years (depends on the country and other circumstances)
- For Schengen countries and other cooperations, data is shared. A fake document in an application to one will blacklisted you for all others.
Do NOT, ever, submit fake documents. Do NOT, ever, let someone file fake documents or applications with false information on your behalf. Do NOT trust “visa agencies” that will do that for you.