Eldritch Manor by Kiim Thompson

Eldritch Manor is about a girl named Willa Fuller who thinks that the old mansion down her street is peculiar. One summer day she hears a eerie song and walks into the mansion. Willa finds that an old lady in a wheelchair who freaks her out and keeps on asking her to take her to the ocean and a locked doll house, Willa wonders why they would keep a dollhouse locked.She also finds old people and discovers it's just a retirement home. There's a mean lady named Mrs. Trang who shooes her out of the mansion.When Willa gets home, she can't stop thinking about the mansion. even though it seems like a normal retirement home, Willa feels as if there's more to it than that. Soon she gets a job to help out at the retirement home and discovers, it is really more than a retirement home. It is a safety home for magical creatures such as mermaids fairies and phoenixes. Not long after she has started her job, Mrs. Trang leaves without a reason and strange things start to happen which cause the strikes the whole mansion with fear. I'll leave the end for you to read!