It sucks, yeah. But sexual attraction is often separate from emotional/personality bonds. It's what helps define the difference between friendship and not.

It really does suck that she isn't feeling any connection with you sexually. I can only imagine the feeling of pain that must be causing.

Some relationships can work without the level of sexual chemistry that she may be wanting - everyone is different in what they will/won't/can/can't handle/accept.

There's not much at all you can do about it - and thankfully she's telling you before getting into a full relationship with you. Look at how much pain you are already in? You'll be in a lot more pain if she was to continue the relationship knowing that she doesn't feel that connection to you.