Sorry you lost her. External/internal parasites weaken a birds immune system to the point that they are susceptable to all kinds of diseases; bacterial, viral, or fungal. I recommend sevin dust to dust all your birds, redust them again in 7-10 days to kill nits hatched from eggs. Dust inside their coop, nests and roosts. Repeat again in 7-10 days.
As far as worming goes, it depends on your soil how often you should worm. If your soil is warm and moist most of the year, you may need to worm several times a year. I worm my birds once every 3 months or sooner, especially this past year with the 2 tropical storms we've had and afternoon storms. If you live in an area where the soil is cold mountainous or rocky, or very hot desertlike soil....you may need to only worm once a year. It all depends on your environment. I do not recommend worming during molt. The birds are already stressed during molt and use all their resources to regrow feathers, no need to increase stress. Some people still worm during molt, if you do, dont use fenbendazole/panacur. It will cause regrowing feathers to be blunted and crooked. The safest wormer on the market is valbazen (albendazole) cattle/sheep wormer.
Valbazen slowly kills all types of worms over a 3-5 day period of time. There's no need to worry about toxic dead worm overload using valbazen. Redose again with valbazen in 10 days after the initial worming to kill larva hatched from eggs.