I'm not sure about the life preserver either. I've never had her on a boat however although she used to be able to swim a quarter of a mile across a lake and back-and then do it again without much rest.
One thing to keep in mind. She should buy only the best food out there for her Springer. They are high energy guys and girls and need good quality food-just don't over feed them-as a lot of people I know do just that. As far as food goes the researchers in this domain have found that the very high end Purina products that focus on the gastroentestinal formula-both canned and kibble are the best for these dogs. But pet stores don't carry them for over the counter sales-you need a prescription-but once you have the prescription you can get the stuff delivered be Amazon regularly. We use "ProPlan Veterinary Diets-EN Gastroenteric" (both kibble and canned)
If she feeds her doggie (not too much again) -keep her in fresh water each day-run her like crazy-she will have a wonderful dog that eveyone, including nighbors will love for a long time. Like I said-Pepper is 12 and hasn't slowed down and looks like she was 4 yrs old. She likely will outlive both Barb and myself-.And I'm not sure I enjoy that thought.