Do I need pay Long\ Short term capital Tax If I have not any other income or not in any Tax Slab

Hello,

Do I still need to pay Long \ Short Term Capital gain Tax if a person do not have any other income or do not comes under any Tax Slab .

For Example, My wife is not having any income sources , Does she require to pay Long\Short term capital gain as she does not comes under any Tax Slab criteria.

Thanks for your help.

Regards