Pugs can take a long time to heal just by the nature of their anatomy. They eye protrudes so far that it tends to take longer for this type of eye to heal. I would be cautious though because the eye can get really bad really quick. If you have any doubts as to healing I would have it re-evaluated so that it doesn't get to deep into the cornea at which point it is much more difficult to heal. It may be that she needs a different antibiotic or needs other types of medications to help the healing or even surgery to protect the eye. You could take her back for a recheck with your vet or go for a second opinion. It could take 2-3 weeks for this to heal but like I said any doubt I would have it checked out.