Hey Prakash!

As per the past year cutoffs , your sister would get admission in government colleges. But this year , the cutoffs are most likely to increase because of the easy level of question paper. So ,a score of 550 is not enough for your sister to get a government  seat in bihar under state quota.

To know the cutoffs of all the colleges of bihar , follow the given link :

https://medicine.careers360.com/articles/neet-cutoff-bihar

To predict your chances in all the colleges on the basis of your NEET AIR ,use NEET PREDICTOR TOOL :

https://medicine.careers360.com/neet-college-predictor?icn=neet-clgpdici%3Dqna-answer

Hope it helps!