The problem is not sex addiction, but sexual desire not properly
handled.
She has urges to indulge in sex.
Firstly she knows of her "condition" she should refrain from
marriage, stay single.
Secondly, she should seek out one night stands with proper
control.
Thirdly, she should practice safe sex, condoms compulsory, no
oral sex, no kissing.
Fourth, she should be descrete, and not be 'famous'.
Fifth, all romps are purely for sex and orgasm, not love.
With proper control, there is no reason why she cannot be a
nymph.