Swimming for Sunlight by Allie Larkin
One thing Katie Ellis won't part with in her divorce is her dog. She'll let her husband cheat and leave her for his mistress, but Bark is hers. Once her lawyer fights to ensure she has custody of Bark, she packs up most of her items and heads to Florida to start over.
Florida holds horrible memories for her, but she also was welcomed into her grandmother's fold of close friends. There, Katie joins in on their plan to go back to their pasts when they were part of a troupe of performing mermaids. She'll do the costume, even if them being in the water is terrifying to her. It may be just what she needs to come to terms with her past and build a worthwhile future.
I loved Nan's friends. They were a riot. Katie is definitely an anxiety-ridden person, and it takes her time to come to terms with everything. One thing remains clear in this book, life is what you make of it and, sometimes, you have to be bold! Read Swimming for Sunlight. It's a lot of fun.