B.Arch

All the B Arch admissions are base on state level entrance exams or AEEE or JEE or NATA etc. And the eligibility criteria to appear for these exams is either 10+2 with physics, chemistry and mathematics or 10+3 with mathematics as main subject. Therefore diploma in interior design won't provide eligibility neither to appear for entrance exams nor to take up the admission to B Arch course directly, unless one should possess 10+2 with science stream or 10+3 with mathematics as main subject.

Yes of course she can.

To be honest you can't get admission in IIT from JEE B.Arch as first you need to qualify JEE Mains Paper 1 and then give JEE Advance after that you need to give AAT Architectural Aptitude Test ) conducted by IIT's after qualifying in all 3 exams then you can get admission in IIT B.Arch.

Most of the top architecture colleges use NATA score for B.Arch admission. Some colleges also accept JEE score. NATA is most accepted exam for B.Arch & B. Planning. Few reputed colleges for B.Arch are -
- IIT Khargapur
- " Roorkee
- SPA Delhi
- " Bhopal
- JMI Delhi
- NIT Calicut
- CEPT Ahmedabad
- SAP Vijayawada
- NIT Trichupali
- IIEST Shibpur
Best wishes.