I would recommend the Acerbis Lady Fusion because it fits well in the chest area, but if she's 5'5" and 110 pounds she probably will find it doesn't fit well in the shoulders. I'm 5'5" and 130 pounds and narrow in the shoulder area. I love my CP except for the shoulder thing...the shoulders tend to droop down and then the CP will slide around a bit. I'm not sure if there are any other manufacturers that make women's CP's though. I have learned that mens CP's don't fit women with any sort of chest, they tend to stick out on the bottom because the top doesn't make up for breast size where as the lady fusion is molded specifically with women in mind. If you can't find anything else you like, get her the lady fusion, she just may like it.