This is a friend who spends every birthday upset that none of her friends make a sufficient fuss of her. I accept that her feelings come from a background of real neglect, and she's careful never to make it personal to me... but at the same time, she is almost 30.
And now she's forgotten my birthday. Unlike her, I'm not hugely bothered about celebrating and I know that no friendship is fully equal in every regard, but a card would have been nice.
Should I send her a lighthearted email gently pointing it out? Or just get over it?