it is not the best idea to continue intense marathon training with a relatively short turn around, 3 months, and then continue to train for several more months for the Olympics.
First of all, her coach said she wasn't doing regular marathon training, but just doing a few longer runs.
Regarding "intense marathon training," and kind of training, regardless of event needs to be balanced with recovery, so that shouldn't be an issue.
A 3 month period is plenty of time and is not a short turnaround.
Which leaves, 7 more months in between.