There is no such thing as a pink TR. Its funny really what you have to do for your girlfriend. But im sure i have seen a T series in some shade of red. Thats almost as close to pink i have seen anything. But then red is really not pink at all. So may be someone else here will be able to help you.
If you’re really serious about this you can contact Colorware and they might be able to color a TR for you. I expect that it would be crazy expensive to do but it would definitely be one of a kind.
Of course, you’ll have to pray nothing happens to the TR and you have to send it in for service.