You really just need to call the rental car company itself. Be sure to tell them it's your sister and how old she is. (25 yoa minimum for sure)
BTW, most companies do not consider members of the same family as 'additional drivers'.
You would definitely be able to go to a different location of the same company and 'sign her up' if they did require it though.
I use the rental car company matrix on Orbitz to compare rates. It is really easy to use and shows all rates for all the companies.
Good Luck
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