I'm really glad to see her do the Trials. I expected her to do them, but this confirms it.
As for doing Boston as well, why not? She's a professional and it's a total pro move. Boston needs and pays well for American stars and she is one of them. Assuming she makes the Olympic team, a medal is most likely not going to happen there, so why not run Boston where she is a legend.
Another Boston legend, Meb, has shown people can run pretty good marathons 6 weeks apart and she'd have 3 months to the Olympics.
Good for the sport, good for Des, good for Boston in my book.