At and in are possible. To would only work if she got to the pool by swimming, perhaps by swimming in the river that flows by the pool.
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lucas21cCould you confrim whether all of (A)~(C) are okay in the following sentence?'To' is not OK. Did you mean to mix pronouns?
lucas21cThen, could you tell me what the difference is between 'go swimming at her local pool' and 'go swimming in her local pool'?There isn't much difference, but at might suggest at the facility, while in would suggest in the pool itself. To clarify: She saw the boy in the pool would mean he was in the water, while