Sudden changes in eating habits

My 6 year old daughter has suddenly began chewing food for an unreasonable amount of time, at times she chews and then spits out. She also seems to be eating less and is more sensitive to tastes and smells.She has always been sensitive to clothing, but I just assumed it was something she would grow out of. These issues are getting worse and the new eating problems have surfaced, this is of great concern to her father and myself. Could this be a sensory issue? Thank you for your responses.