To find out how much money Emma had before she bought the salad and drink, we need to add the cost of the salad and drink to the amount she has left.
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First, we find the total amount spent: \[ \text{Total spent} = \text{Cost of salad} + \text{Cost of drink} \] \[ \text{Total spent} = 4.75 + 1.65 = 6.40 \]
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Next, we add the total spent to the amount she has left: \[ \text{Total money before purchase} = \text{Amount left} + \text{Total spent} \] \[ \text{Total money before purchase} = 18.35 + 6.40 = 24.75 \]
Thus, Emma had $24.75 before she bought the salad and drink.
The answer is \( \boxed{24.75} \).