Constitutional remedy for a 2&1/2 year old

Hello docs,
I am looking for some constitutional remedy for my 2&1/2 year old. She gets sick very often mostly colds and flus.It takes a long time for her to get better completely. Her nose runs with greenish and yellowish mucus, decrease appetatite. She is very tall (75%), slender (50% weight), and very advanced. She is patient, shy and fears anything that we tell her is scary and dangerous. NOt very adventurous. She is talkative and sharing with people she knows, but with strangers very shy. She is lover of sweets and milk. She used to evacuate 3 times a day, but has developed of holding her stools when in day-care and sometimes that gets her constipated. She also has developed small pimple like bumps on facial skin that are not reddish, but are hard and skin colored. SHe is allergic to mosquito bites, and they give big rashes.

Please help me docs to correct her constitutional imbalance whatever it could be. Thanks.