No problem, thats what we are here for.
Well it does sound like she likes you, walking round the park and hinting that you are her type (in one way anyway), they have to be good signs.

But dont forget that friends will meen something to her aswell, and she needs to put time aside for them. I know a few girls who have vowed to put their friends before any relationships they have, but it might not be that bad in your case, since she does seam to give you alot of attention.

If she does like you, she wont wait forever for you, but your thinking about making a move soon, so thats good.

But Im not so sure about the card.
If she is very shy, then she might like the time to think it over. But from the experience Ive had I never got a reply that way, so I had to be a little more direct and talk to her. But she might not react that way, she might tell you as soon as she sees you.

Or you could talk to her properly, try to hint at what you are going to say though, I know its easier just to blutter it out, but you dont want to surprise her, you might not get a decent answer. But girls usualy like a guy who has the confidence to talk to them properly.

Wether it is best to go for the card, or talking to her depends on how shy you think she is.
But its not like if you pick the wrong one, you lose. It just means you will start off a little slower.

Anyway, dont forget to read everyone elces advice, since they are probaly much more experienced than me.
Good Luck!

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