I think you must mean you are doing 2 sets, not reps
Has your trainer changed your nutrition since you've lost 32 pounds? The amount of calories that you need has changed.
I'd also change that exercise routine! Look at changing from a full body workout to some kind of split: legs, back and shoulders, chest biceps and triceps...or any other way that you can fit all your body parts into your 3 days of lifting. (Note: don't do legs and any other large muscle group on the same day!) Doing a split workout allows you to do more sets per body part so that you'll see more results.
Or just change the exercises, the intensity, and your diet. If you've hit a plateau, most of the time it's a nutritional problem.
Mel