I would be hurt by that comment too, especially with her gifting history. And, like you, I likely would have been stunned and wouldn't have said anything about it at the time, but it would continue to bug me. And then no, I also would no longer feel like including her in my special events, because I'd just been hit over the head with the fact that apparently, I'm not special to her.
Frankly, the constant regifting would make it seem like I'm nothing more than an afterthought to her. Especially when you learn she can take care (and go to a store) to select gifts, just not for you.
OP, what is she like otherwise? Does she seem to be a user/taker, or is it a pretty reciprocal friendship? You mentioned that you include her in your family celebrations, console her when she's going through rough times, or take care of her pet(s) when she's away. Take a step back....does she reciprocate any of this for you?
Hard questions, I know. But I suppose it's better to find out your status now rather than let even more time go by.