Take her on a real fishing trip. She obviously knows that fishing is important to you. She probablly also knows that getting in the way of fishing is going to be a struggle, so she has decided to try joining you. I took my wife on a 13 hour trip down the Ho for Spring Chinook. While I don't recommend this for your own sanity, it worked out rather well. She now knows that I'm a lunatic, and allows me to fish whenever I want. I actually bet her $100 that she couldn't make it through the trip without complaining. She made it to 1:00 before she finally exploded....... (It was pretty damn cold for a rainy haily stormy day in May) We finally caught a springer at about 7:00 in the evening..... She will now only consider fishing if I take her on a half day float in the middle of the summer..... which is fine by me. It makes for a funny story to tell around the dinner table as well...... (I would recommend bringing a propane heater, even if it is a small one!!! )
My brother was succesful at turning his fiance into a true steelheader by starting her out with short trips. She now catches 10-15 steelhead a year. She is a trooper though and doesn't mind the cold.

Mexico is a great alternative, just not as cheap.
regards,
Neal