There are different forms of Shabby Chic. Prints can be included but the color palette is always muted and the prints are never busy or overbearing. Understated is the operative word.
You didn't mention her present decor, that may provide clues on how she leans. The French variation includes lots of white, slipcovers, and linen is in abundance. It's close to the popular farmhouse style that's been very prevalent as of late.
Rachel Ashwell and
Tilda are the most popular representations at present.