Theresa drank 5 ounces of wine which is equal with one standard drink.
The standard drink is defined as: 5 ounces of table wine, 12 ounces of beer, 1.5 ounces of distilled spirits (e.g., vodka, whiskey), 8-9 ounces of malt liquors or 3.3 ounces of champagne. Standard drinks are introduced in order to measure and define Alcohol By Volume (ABV).
So, the amount of wine Theresa drank (5 ounces of wine) has about as much alcohol as the amount that is in 12 ounces of beer, or 1.5 ounces of distilled spirits (e.g., vodka, whiskey), or 8-9 ounces of malt liquors or 3.3 ounces of champagne.