
Is this a common trait with the breed? Has the vet checked her eyes for ulceration to the eyeball which would mean in growing lashes which are scratching each time the eye is opened and closed. Another poblem is blocked tear ducts, this could be caused by infection or be a fault during development in utero where the tear ducts were malformed and would need surgery to correct the problem.
I got a 6 month old dachsie bitch who had one weepy eye, no mechanical problem was found and by 8 months old when her head had stopped growing the tears stopped, took a while longer for the stained hair to be replaced but now she is 6yrs old and you would never know there had been a problem.
I tried a couple of products to try and clean the hair under eye, they worked a bit but never cleared it so I gave up doIng it, as I said before it went away naturally.
Hopefully someone who knows your breed will be able to give you more help.