As John Morrow and Andy Lemke point out in the question comment section, there's a bit of a seeming paradox at play. Specifically, John says:
This is kind of like asking how you prevent being thirsty if you refuse to drink anything…
Which got me to thinking… If I didn't want to be thirsty, and I refused to drink liquids… I could set myself up an IV drip and stay hydrated that way.
There is a similar analogue to address sexual urges – you can medicate them away. This is pretty inadvisable stuff generally speaking, but for some, including repeat sex offenders, it's the only way to manage through the problem, at least until stability is achieved, and other parts of life are going well.
Take, for example, this Brazilian woman – she was so compulsively horny, that she got a selection of prescriptions from her doctor just to be able to get her jilling sessions down from 45 to 18 per day, allowing her to keep her job (at least, after a subsequent lawsuit that supported her right to masturbate in the office).
Perhaps the hypothetical single woman could simply find a combination of pills/patches/therapies which would dull certain senses, or suppress certain hormones enough to get by until finding a proper long term relationship… Which reminds me, sometimes birth control pills can have an "evening out" effect – either generally increasing or decreasing libido. Since the single female mentioned seemed disinterested in casual sex, it's not a far leap to think she may not be regularly taking birth control pills – and if not, that's certainly a great, fairly safe, and otherwise-useful[*] thing to try as a first step.
Anyway, as with any significant physiological issue that is disrupting one's routine, the best first step is to see an experienced physician, and get educated on options for testing, diagnosis and treatment.
[* Especially if she changes her mind on the casual sex thing suddenly…]
deano.com 
what horniness?
Hey, I didn’t write the question, only one answer to it. You may wish to take your question up with Quora.