The LSAT is merely predictive of how one will perform in law school (and acknowledged as not a very good one at that, merely the best one available). However, actual law school grades are HIGHLY indicative of how one will perform in law school. If that holds true, then s/he needs something that will show why s/he will do better the second time around and why a school should give him/her one of their incoming 1L seats when there are plenty of people that haven't met academic failure that would want that spot.
I don't have a good suggestion on what to do, merely criticism that retaking the LSAT probably won't be nearly as helpful as it would be for a 0L applicant. Perhaps see if there's some way to take a law school class over the summer and demonstrate the ability to handle the work?
PS: Without any other information, such as GPA, prior LSAT scores or even what school s/he was dismissed from, it's kinda hard to say 'attend a T1 at the lowest', especially with a demonstrated lack of sucess in law school.