Try to find something knife related that she can relate to. I have seen those SAK classics in pink. Nice small knives, perfect size for her. Show her how knives are used in the kitchen to prepare food for meals and at the table to cut meat and such, and how those knives are not really that different from pocket knives.
Show her how knives can be used for everyday tasks, such as cutting a thread, or opening a box, or slicing an apple.
Also, maybe carry a more traditional knife like a stockman or peanut for use around her. Those tend to be a little less "scary".
Finally, try to explain to her that knives are tools. People make them into weapons by using them as weapons. Anything can be made into a weapon; a pencil, a plastic spoon, etc. It's what you use them for that makes the difference.
"you know the road doesn't end, when it reaches a bend..." - Poco
Proud Supporter of JK Knives #65