Step 1: Understanding the sentence.
The word unless means "if not".
The sentence means: If she does not practise every day, she will not be able to meet her goal.
Step 2: Converting using 'If'.
When rewriting a sentence with unless into one beginning with If, we remove the negative idea carefully.
The correct transformation is: If she practises every day, she will be able to meet her goal.
Step 3: Analyzing the options.
(A) correctly expresses the positive condition required to meet her goal.
(B) keeps the negative meaning incorrectly.
(C) changes the meaning completely.
(D) also gives the wrong meaning.
Step 4: Conclusion.
Therefore, the correct rewritten sentence is option (A).