
You should probably have her eyes checked by a vet to make sure her tear ducts aren't blocked or that there is nothing else going on there.
She might be teething which can make their eyes run, and it could be food colouring in her food which can cause the tears to be
stained or even certain minerals in your tap water can cause pink stains.
I don't use anything to remove tear stains as most of them are chemical based. I just live with it.
I find using rain water as their drinking water and feeding a raw natural diet too really does help.
Liz R