It's not recommended to use diaper creams with microsuede or microfleece diapers (like Fuzzi Bunz and Bum Genius) unless you use a liner (like Bummis flushable liners). If you're using cotton diapers, the Earth Mama Angel Baby cream is safe to use. Just buy the small size... it lasts forever! I've used it with BG and FB in super small amounts without a liner, but the oils can and do build up on the synthetic materials.
IMO, Johnson stuff is pretty nasty stuff... it wouldn't be my choice to use it on any baby, but especially not if you think she also might have sensitive skin. Synthetic fragrances are something we definitely avoid in our house, especially in the products we slather on our kid, who's little system is especially vulnerable to the endocrine-disrupting effects that such chemicals can have. We also avoid products that are contaminated with 1, 4 dioxane and formaldehyde, which are cancer-causing chemicals. J&J has both. Last year there was a lawsuit against J&J over its baby shampoo being contaminated with methylene chloride, which is a carcinogen. I know many feel comfortable with their products (and other popular brands that contain the same chemicals), but I think it's pretty important to do some research on it before you make your own choice.