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Silver plant dies

The domain investor had purchased a silver plant, which had silver color leaves from a local nursery.
It was an indoor plant, so she kept it on the window ledge
However after about 15 days, she has found that the plant has withered and died
Trying to revive the plant, she kept it in her terrace garden, however the plant still withered and died
Any tips to revive the plant will be greatly appreciated.