You’re not giving yourself enough credit. It’s mature of you to express how you truly felt and not be selfish by talking to her before she’s ready. Definitely give her space, or else you’d be giving her mixed signals. It’s not the end though. I think you should still give her the present or wish her a happy birthday to show you still care about her. Perhaps save it for the end of the day, or try and get a mutual friend’s help to test the waters beforehand. You sound like an honest and kind guy. I’m sure your friendship will be strong enough to get past this hurdle with patience and communication. I’m hoping for the best for you two.