She can claim you if she meets the qualifications.
The easiest way to find out is to go to the My Info section of TurboTax and have her answer the dependent questions.
It may save her some money.
Information about who can be claimed as a dependent can be found at this TurboTax website: Who can I claim as my dependent?
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If you had over $4200 of income from any source other than Social Security in 2019, you cannot be claimed as anyone else's dependent. And...if anyone claims you as a dependent you cannot receive the $1200 stimulus check.
If your sister claims you all she gets is a $500 credit for other dependents.
CREDIT FOR OTHER DEPENDENTS