Carolyn Wells 
Patty’s Friends & The Jingle Book 

Patty makes friends in England, and helps some of them find a lost family fortune. This is the 6th book in the series of Patty books. This one has Patty living in England for the summer, and there are two story lines. The first is her acquaintance with Lady Hamilton, and her trying to reconcile her with her estranged father. The 2nd is in the summer home of Cromarty Manor and trying to find their hidden treasure, so they can restore their English Manor home. (goodreads)