My ATF's birthday is coming up soon and I am thinking of getting her some lingerie and I would see her
that day if she is available but it may not be a good touch.  
Does anyone have any better ideas to celebrate her birthday such as bringing wine or a cake? lol

Can't go wrong with cash in a card!  

Thank you for the advice....  Lol, yes, I just want to surprise her. I know what she likes but wanted to know what women in general appreciate the most for an occasion like this.  

Hi there! My very first gentleman brought me some chocolates and I was so very surprised. It was the sweetest gesture, and unless there's an allergy I feel like chocolate, women, and certain activities are always a good combination . I don't know what brands of lingerie she prefers, but I really like Josie you can find it at Nordstrom in a good variety. I would suggest the one in Tyson's Corner if that's doable.

Thank you ANaturalBeauty for the advice.  

This is well said. Thank you so much.

cash is Always king for something extra gift card is a lovely gesture.

meaning something SHE wants.If you're listening  to her during your conversations you should know what that is.

. . . lotsa CASH!

I once had a guest surprise me with an edible arrangement and on the card a cute message about giving a helping hand on keeping my puppies contained. I later received an e-gift card to buy bras, which was probably the best gift ever! It was thoughtful, tasty, and definitely a surprise! If your lady has larger boobs, might I suggest the same. Shoot, even if she doesn't a nice Victorias Secret gift card would still be cool. Women love bras. Lingerie is cool, but bras are so much better IMO! We wear them every day and they can get costly.
 
I am sure there is something she has said in previous visits that will give you a inkling as to what she likes to do, wear, eat, etc in her personal life. If you can't recall, I am sure asking will do the trick, even though that ruins the element of surprise.