My suggestion is that if you haven't met or haven't met for a long time, when you meet it should be on an important date and organized with everyone that needs to know except her, make sure she's going to be at home when you surprise her, slip a note or letter through the letter box being careful not to be seen, with a note at the end saying to go look outside, where you will be standing with flowers/gift/whatever your preference. I plan to try this next year when I meet my girlfriend for the first time ever. I know she'll never suspect it and I'm trying to organise it with hre parents.
