One month girlfriend hey? I know she will have been talking to you about her life up till now nonstop! Have you been listening at all? If you are walking through the local shopping centre (or mall if you like), has she looked at something in a shop window and said "oh I love them" or something else like that? Is there a concert she said she wanted to go to? Some local tourist attraction she has never gotten around to visiting? The hints were all there, you just have to pick them up.
If you really like this girl, you get serious brownie points for giving tangible proof you actually listen to her. The good thing here is it doesn't have to be expensive, it's that you took notice of what she said that will put you in the good books.
Failing that, go and buy her a small rosebush (not a bunch of roses), get yourself a pot and some potting mix. Then you can spend 10 minutes 'planting it together'. Women lap that romantic sh!t up and it would probably be cheaper than some of the boxes of chocolate you might have been looking at.
Cheers