Allergy Rhinitis

Hi,
My Daughter is 3 yrs old. She is suffering from allergy rhintinis. We are living in pune for last 10 months where there is damp weather from 15th june to sept,with hardly any sun till august. Her problem started on 2nd july with cold and cough. I gave her rhustox 30 and allium cipa 30 4 times daily as she was sneezing, watery eyes. after a week Her cough was during sleeping time only and she was vomiting while coughing, nose was blocked , she breathes thru nose throughout the day only around 9 she starts breathing through mouth and while sleeping so switched to ipecoc 30 and arsenic alb 30. As conditions didn't improve we visited paediatrician and he said her nose is blocked as nasal passage is thinned because of swelling of inner lining. She had antibiotics cefadur for 3 days, salmucolite and phenergan , otrivin drops for 5 days. She was better with just nose block during sleeping. After 2 days night cough started with allergic symptoms and fever. As she was getting dull I gave her gelesium 30 and ipecoc 30 for a week. She improved except blockage and snoring while she sleeps. I gave sulphur 30 3 dose in day and then again gelesium and ipecoc for 3 days. Meanwhile as cough during night was not improving and nose was blocked during night we visited another paediatrician who said its nothing but Allergy rhintinis and advised allegra 2.5 ml twice and otrivin drops for 1 month. Which I don't gave her. Another homoeopath gave me this remedy
Basillium 200 2 dose in a week.
tecurium meram verum Q 5 drops 4 times.
Dalcamara 30 4 times 4 gobules.
After 3 days my daughter sat on wet floor in school or we went to shopping and allergic symptoms of watery eyes, running nose, sneezing started with mild fever 99.
Dr advised me to give arsenic alb for 2-3 days. today is first.
She got her first case of cold when she was 9 ( in may )months which was cured by ars alb and belladona. She regularly gets cold after 3-4 months mainly during change of season. mostly from summers to rainy season and then in the beginning of winter season. Nov when we were in delhi and in Jan when we were in pune. generally its running nose with cough while sleeping with no fever.
Is there a permanenet remedy for it? How can I prevent her or improve her immunity system. She was ceaserean full time( as I am short in height) born on 26th august 2003. I fed her my milk till she was 1.5 yrs. She doesn't like sweet things much not ven toffees. She is 10kg. Very active and very intelligent. Except for problem of cold and occassional diarrehea during teething she didn't had any illness.