Estimated Tax payments

Hi,

I completed my Mother in Law taxes and she owes over $5000. TurboTax also said we should pay estimated taxes for next year. The reason why she owes $5000 is because she cashed in savings bonds and had interest of over $31,000. That's not going to be the norm every year going forward. Any suggestions as to how we should proceed? We don't want to pay estimated taxes if its not necessary.

Thanks