Some general advice:
- Stay skeptical. Ask pros and cons for very decision. Do not leave someone else manage everything.
- Take an online class on personal finance and/or buy a good book on the topic. This Course on Coursera looks like a good starting point. Keep your skepticism and stay curious.
- Stay simple. Any complicated financial arrangements is likely a bad idea if you're not an expert.
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Some more specific advice:
- Decide what's her investment horizon. When does she think she'll cash out that money? Try to make a "cashing-out" by year for the decades to come.
- Decide if you want to do it "manual" or buy ETFs -- portfolios geared for her profile.
- Manual -> Open brokerage account [Vanguard, Schwab, ...], pick a mix between "equity", long-term maturity debt, short-term maturity debt ("cash"). The weight on the later should increase as she approaches retirement.
- Automatic -> Open brokerage account [Vanguard, Schwab, ...], research the right "ETFs". Some directly target a certain "cash-out profile". Look for "low expense ratio" (= low fees) funds.
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