My sister,age 23 years was diagnosed with  Covid( completely asymptomatic) by RTPCR on 2nd february, following which she went in home isolation. Her in-laws came Covid positive on 7th feb by RTPCR after which they all stopped following isolation from each other within their house premises.Does my sister's isolation duration count from 2nd feb or from 7th feb onwards.Also her repeat RTPCR was positive on date 14th feb.Kindly advise when she can come out of isolation.