You are both still young, which means a heavy exposure to equities is desirable.
However I would never advise anyone who is not comfortable with investing to throw $225,000 into it immediately.
You drip feed it in and slowly build up your mental tolerance to having assets and investments. You have to train yourself to not be worried about the daily fluctuations of $200, before you can be comfortable with daily fluctuations of $2,000 or $20,000.
It sounds like this is where your wife is at. She might come around eventually, but it will take a bit of time.