In such situations, there could be number of reasons for your plateau:
1. You could be eating too much or your macronutrient profile may not be what your body best responds too.
2. You could not be eating enough, preventing you from gaining muscle and making it harder to lose fat.
3. You could be "under-recovering" - that is, doing too much physical activity. Cortisol is not your friend.
4. You may have adapted to your current routine.
Analyze your diet. Most of the time for me, a change in diet provides the biggest leap forward in progress. Get plenty of protein and healthy fats, don't eat processed or sugary foods, and load up on veggies.
Try HIIT instead steady state cardio. Lift HEAVY - my wife deadlifts with over 200lbs regularly. Guejsn (another forum member here) pushes herself with very intense lifting sessions. Those "pinky" dumbbells are not going to burn nearly as many calories as a much heavier load.
I'm sure the ladies will chime in here with their own tips; for example I know Crader and BW seem to respond best to the exact opposite kind of routines.