I'm no expert but I would think that if the eye drops aren't working that maybe the weepy eye is being caused by something else.
My bunny, Dude, had e-cuniculi last year which left him with a permanent head tilt. Back in February, his right eye (the one tilted toward the ground) started to weep. The vet gave him an eye ointment (Gentamicin) that we used 3 times a day for 2 weeks. It has since gotten better but still weeps slightly on occasion.
The vet told me that there are numerous causes for a weepy eye. I would suggest that your friend take the bunny back in. Maybe there is another cause for the weepy eye other than the irritation from the hay.
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