This is a pretty brave step to turn a business that has give income into a risky investment, but it could be that he already considered everything beforehand, and his decision to sell all of his taxis and buy BTC because the income earned from the taxi business began to decline due to this pandemic, she thought to secure residual assets on investments that can provide large returns.

I even think this is not a good step especially if she buys coins based only on suggestions from people.

This story is actually not very clear because it could be that she already has reserve funds to wait until his investment in BTC gives her the profit she has targeted.