How to help my girlfriend get over her fear?

My girlfriend has a phobia of bugs she's even more scared of them now after a story she read it was a true story. There was this young girl who was found neglected by her family living in a room with feces filth and bugs everywhere she was only 7 when she was rescued had cockroaches everywhere bug bites on her living in a dirty diaper for who knows how long. Good thing the neighbors noticed because she was almost a skeleton close to death covered in bugs and filth. That terrified my girlfriend now she's even more afraid of bugs especially roaches. This scares her even more. The only bugs she likes are fireflies and butterflies. How can I help her get over this fear?
How to help my girlfriend get over her fear?
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