If she had them "several years" ago, her immune system has very probably got rid of that strain of the virus and the strains linked to genital warts are not the same as the ones linked to cervical cancer.
You can - and nearly everyone does - have more than one strain at some point in your life.
It's possible to pay for Gardasil, the vaccine that protects against the genital wart pair as well as the two main cervical cancer pair. Given that you've been sexual with other people, it's extremely likely you've got / had at least one strain and if you've already got / had them, it's a waste of money as you wouldn't get any benefit. (And the makers very definitely did the clinical trials in the hope that you would: when it arrived, it and the 'cervical cancer pair only' equivalent from another firm were the most expensive vaccines ever.)