Yes, your daughter can join B.E. Computer Science after completing her Diploma in Computer Science. She is eligible for lateral entry admission , which means she can directly join 2nd year of the B.E. course through the Lateral Entry Scheme .

Most states, including Tamil Nadu, conduct a separate counselling process for diploma holders. In Tamil Nadu, it's through Direct Second Year (Lateral Entry) Counselling organized by DOTE (Directorate of Technical Education). She must have passed all diploma subjects without any backlogs to be eligible.

Also, ensure she meets the minimum percentage required (usually around 50% for general and 45% for reserved categories). Admissions are based on merit, and she can apply to both government and private engineering colleges.