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You can soak her food to make it easier to eat and also add a little extra in the form of of things like plain chicken, pasta or babyfood however the dry mix needs to be her main diet. Weight loss is normal as hamsters age and at two she is getting to be an elderly hammie. Too much protein can stress her kidneys at this age so it needs balanced.
The teeth are an issue though as they sound to have shifted so they they are no longer meeting and wearing against each other so they will keep overgrowing quickly. It's not so much the chewing chew toys that wears them you see but the rubbing against each other during normal eating. Too much wet will mean too little chewing but if they are already maloccluded then they will need continual trimming