ln order to make suggestions, it would be helpful to have somewhere to start. Can you tell us a little about your girlfriend? For example, is she outdoorsy/sporty, etc.? What's her style, eg. classic/vintage, grungy, trendy, etc.? Are you looking for an everyday, "office" type scent, or something more seductive for evenings?
You said you got her interested in scents recently; did she express any particular preferences?
You are a very nice chap to think of doing this for your lady!