It seems from the history that your grand daughter had injury
to the eye leading to corneal scratch.
Corneal scratch indicates corneal epithelial defect. Corneal epitehlial defect is very painful condition and it may get sometimes get infected, hence it requires appropriate treatment. The treatment is by antibiotic eye drops or eye ointment along with lubricating gels.
Eye patch is helpful to reduce pain, but patch should be used in cases where the corneal epithelial defect is infected. This would be determined by a ophthalmologist, hence please do consult eye doctor .