How can my daughter migrate in the 2nd-year of B.Tech?

On the medical grounds, you can change your college and university. Sometimes they ask you pay full fees of remaining three years. You write a letter to AICTE. The reason related to the health of the student should work. I hope that might help.

College change or university change after first year is completely dependent on college and university norms, some college/university allow it and some won't plus you need to have good scores in first year to apply for the same. For further details contact the college authorities.