This singer is currently at the peak of her career.
Tips
usage
全盛 almost always pairs with 时期 (shíqī, 'period') or 时代 (shídài, 'era') — 全盛时期 is a fixed collocation meaning 'heyday' or 'golden age'. Used for empires, careers, athletes, art movements.
memory
全 = 'whole/full' + 盛 = 'flourishing/abundant' → 'fully flourishing'. Think of a tree in full bloom with every branch covered.
