I have it mainly in the right nipple and yes, it is very painful. The nipple turns white and then a purplish / deep red as the blood supply returns. It can be excruciating and caused the fissure in my nipple 3 months to heal due to the altered blood supply and continued feeding. I was on nifedipine for a few months (a blood pressure medication / calcium channel blocker) which helped immensely and have weaned off it again now. We continue to exclusively BF.

I find I need to keep the breast warm - multiple clothing layers, and the cold can be painful. I can't feed outside on the right side in the cooler weather because of the pain / discomfort.

IMO - I would get her evaluated by a paed for peace of mind. If she has no pain then generally there is nothing to do except try to keep the areas warm. If there is pain they should be able to refer you to someone who specialises in the management and offer some alternative treatment options.