"Awwww! What a sweet friend."

Sorry dude, sounds like you got LJBF'd (Lets Just Be Friends), you've been on a couple dates and all you've had is a hug and a kiss on the cheek? And now you want to get her a present? Buddy, if you want to get her, you have to be a challenge. Otherwise, you're like every guy who came before you. Now, the mug thing is nice, I'm sure I'd give a platonic friend a get well gift too... but not a chick I'm trying to date. There's a lot of stupid sayings out there when it comes to dating and one is:
"A gift is the way to a woman's heart." Its BS... don't believe it. If you have a strong relationship a gift can make an impact, but if you're in the Friends Lane its not going to work any miracles.

Also, what do you mean:
"I think she is interested in me. I think it just a matter of it needs to be 'officially declared.'"
Her interest in you doesn't need to be sh!t. Women flirt very subtly, if she's interested you have to show that you can pick up on the clues and make a move. What are you waiting for, an engraved invitation? It sounds to me like you just want a hug so that you can ball up and do the job, instead, don't worry about official or not, just make your move, she'll either reciprocate or not and that's that. Just make sure you don't set yourself up for any heartbreak. Hope you can find the directions to get out of Friends Lane.