Originally Posted by
injera
Another thought/suggestion:
If everything runs on time you'll be fine making the 1 hour connection at DTW.
Might I suggest researching some other options. Delta will gladly put your daughter on the following days flight DTW-GRU but you may benefit from researching other options that could lessen the delay ...
Delta will get your daughter to GRU, but i've found, especially with international flights, having some backups in your pocket can come in handy.
if weather looks like an impending problem, get to BOS early enough to ask about an earlier flight to DTW (technically not permitted under Same-Day Confirmed rules, but airport staff will reportedly be proactive in potential IROPS situations)