She may be going through a finger food phase. It's pretty common around that age for babies to only want finger foods for awhile. Try offering some different, age-appropriate finger foods and see if that helps. Well cooked vegetables, cut up soft fruit, and pasta are good options. Offer the spoon every so often, but if she isn't interested, don't push it.
If you've already tried offering other finger foods and she's still only eating cheerios and cheese, keep trying. It's normal for toddlers to only eat certain foods for awhile, then move on to something else. HTH!