* The House of the Spirits (1982)
* Eva Luna (1987)
* Daughter of Fortune (1998)
* The Portrait in Sepia (2011)
While she doesn't use "De la Garza" as part of her name, it's a common surname in Spanish-speaking countries, which could be why you're associating it with her work.
If you're interested in finding out more about Isabel Allende or other authors, you can search online or ask a librarian for help.