People were healed during Jesus' time as a way to authenticate Jesus and his message. I don't believe that Christians are any more likely to be healed today than nonchristians. My late first died from kidney disease when she was 30 despite the prayers of more people than I can count.
Sorry for the loss. God has a reason for everything because God didn't heal some precious to you that doesn't mean God doesn't heal or answer prayers. Jesus still heals, I am not assuming. It is experiential.
Hebrews 13:8 Jesus Christ the same yesterday, and to day, and for ever.
Jesus healed yesterday, Jesus still healed today and will still heal tomorrow because He never changes.