If the surgery was complicated the corneas can be cloudy for several weeks and require additional drops. In addition, the intraocular lens power must be accurate to see well. If she is not improving in a week and you do not have a satisfactory explanation, a second opinion is in order.
Humair Khan, MD
It could take weeks to months and could even be longer should your mother have diabetes, for example, and develop some type of complication such as macular edema.