There are several possible causes including diabetes, low blood calcium, and internal eye diseases. If you wait the disease will advance, raising the risk of severe inflammation inside her eyes. That could cause irreversible eye damage. There are two different methods for eliminating cataracts in dogs. The older approach is simple removal of the lens using conventional surgical instruments.
Most dogs do fine.
The alternative is new and high tech-phacoemulsification, also called ultrasonic lens fragmentation. The latter method has a success rate of 90 percent. She can even have artificial lenses implanted inside her eyes during the procedure to prevent farsightedness. Any veterinary eye specialist can help this girl. But for the ultrasonic procedure you may need to take her to one of the teaching institutions.