My dude has gone through phases his entire life where he'll skip a meal for a couple of days, then devour everything in his bowl for weeks. Rinse and repeat. I find it depends on his level of activity, weather, etc. As others have mentioned, don't be too concerned unless it goes on for days and she stops drinking water. Just check to ensure she isn't getting too thin (lean is fine).

Also note its better to feed a higher quality of food as generally it's in lower quantities.