Can someone die due to Myocarditis Despite No Complications During Pregnancy and Normal Development Milestones?

I am married to my second cousin. During my first pregnancy there were no complications nothing. My daughter was born with normal delivery. She was completely alright and normal baby. Completing her every milestone in time. But at 11 month of the age she got ill and the major symptoms were flu and difficulty in breathing thn she was diagnosed with MYOCARDITIS. And died after 1 week and was under treatment in AFIC (Armed Forces Institute Of Cardiology) Rawalpindi. I was pregnant at that time with my second child. My second daughter was born. She was also completely normal covering every milestone in time. She was treated in al shifa hospital throughout each and every test were clear till the 17 months of age. Thn again once in a while she suffered from same symptoms and diagnosed with MYOCARDITIS. She got treated in Al Shifa hospital Islamabad and expired at the age of 17 months.So now i need some expert advise what to do now. I am not getting any satisfactory answer from any doctor in Pakistan some are claiming it as genetics but some are arguing it can't be this because babies show no defects in any of there milestone throughout their life span. So any thing or any help regarding this is highly appreciated.