PPD positive test

[Rcamphor]

Hi ,

My daughter was born in India and was given BCG vaccine at birth .We have come to U.S recently and her PPD(.1cc 5TU) test was conducted at the age of  1year 12 days .The ppd test have come out to be positive with the induration size as 12by13 mm.The chest X-Ray was conducted there after which has come out to be NEGATIVE.The paediatrician is suggesting to put her on the ISONIAZID for 9 months. We are not keen on giving any medicine (Anti-Biotic) for such a long duration when there is no disease in the first place:

My questions are ::
1.Is there any other test which can be done for her whose results are not affected by prior BCG vaccination .
2.My daughter usually gets big blister even for mosquito bite. Could this  type of her skin sensitivity not reult in bigger induration size?
3.How can doctor be so sure that this positive ppd is indictave of Latent TB and is not an false positive result due to BCG?
4.Can it be done that we do not give her medication right now and conduct the test at later point of time say at 2 or 2.5 yrs of age and then decide what should be done further?
5. Our pediatrician is adamant in giving the medicine, was not happy when we refrained from giving medicine. Can we put our foot down and say no to him. in which case he is asking us to sign some form that we are not willing to giving the prescribed medicine to out kid. Is there any further repurcussion of signing such form?
6. We are anyway planning to change the doctor, please advise what should we consider while transferring from one doctor to another. Can we ask for all the reports and immunization card.

Thanks for quick response.