I would imagine she'll need to sit down and figure out how much rent will be and the cost of setting up the restaurant. Will she have to remodel a place to turn it into a restaurant? If she thinks she can find a place that used to be a restaurant that she can just take over, will she be smart enough to ask "Why is it no longer in business?"
Does she have enough money to pay her suppliers in cash until she gets established? Enough for an advertising budget? Plates, cups, flatware, cooking utensils, dishwasher, freezer, refrigerator, shelving? Accountant to do payroll and business taxes?
My uneducated guess is she'll need to have at least $25,000 on hand to get things rolling.
If she knows nothing about the business, she's doomed, unless she plans to hire an experienced restaurant manager or consultant and that won't be cheap.