Which book did she like the most?

Which book was liked the most by her?

Which book is liked the most by her?

Which book will be liked the most by her?

Which book should be liked the most by her?

All are correct

Which book did she like the most is an interrogative sentence of Past Indefinite Tense.

Which means کونسا یا کونسی یا کس

Book means کتاب

Like the most بہت زیادہ پسند کرنا

Which book did she like the most means وہ کس کتاب کو بہت زیادہ پسند کرتی تھی

Past Indefinite tense

Active Voice= Subject + Second Form of Verb + Object.

Passive Voice = Object + was/were + third of verb + by + subject.