Answer:
The correct arrangement of the jumbled sentence is:
If she doesn't get better, the doctor will need to operate.
Explanation:
This sentence is type 1 of conditional sentences.
There are four common types of conditional sentences.
Type Zero:
It is used for general truths.
Examples:
If you don't work, you don't earn.
If people follow traffic rules, they are safe on roads.
Type One:
We use type one conditional sentences when the outcome of the condition is likely but not certain.
Examples:
If she doesn't get better, the doctor will need to operate.
If he works hard, he will win the prize.
Type Two:
We use type two conditional sentence when the outcome/result of a condition is almost impossible,
Example:
If I won the election, I would make every citizen rich.
Type Three:
We use type three conditional sentences when a condition has not been fulfilled and as a result its outcome too does not happen.
Example:
If he had slept earlier, he would have got up in time.
