She does sound like a typical chinese! If the scab has came off again it will be a case of either leaving it alone or bathing it with just a little saline to keep it clean if you see the wound oozing or feel it`s not healing up. If her claws are overly long, it might be worth having your vet clip just the ends and taking a look at her little wound.
If she plays on the floor/carpeted area, she could have picked up an allergy to house mites or anything that we can`t see. My chinese gets to play on my bed with a fleece blanket over it and plenty of pyjamas and bed jacket to play in!
Her diet sounds fine, but I would leave out the bacon fat (that is saturated fat and not a good thing) and the garden pea will contain sugar, but if it`s only a once a week treat, it should be fine. Raw veg is better for her and a little 5mm piece of broccoli, cauliflower, cucumber or bell pepper are all safe for her without having high sugars.
Chinese hamsters are lovely wee characters eh? I find them very mouse-like (I kept mice for over ten years previously) and the chinese have many of the same characteristics of mice. Gentle in nature and character.