OP said the rent received only equalled the mortgage repayments and as she had the house less than 2 years in all likelyhood it was mostly interest payments rather than capital which are deductable from the the rent received. Plus I assume sister didn't stay there for 2 years. Mortgage was 20% plus renovations = 213K X 20% = 42600 plus 130000 about a mortgage of 170000. Still paying mortgage - sister has moved out and the interest is still deductable (and other costs)as she is in between tenants at this time.
Well done on the triplets. No wonder you're stressed. No need to be stressed about the house though. A good tax advisor will be well worth the money and should be able to bring down any CGT or rental income tax for you. Plus you are about to make a great profit - 164K in 2 years (less taxes) 550 - (213 +130 +43). In addition you have the original 213 clear of taxes. I'd be very happy if I was you.