To summarize what is going on here, for any visa application (except for H1B and immigrant visas, maybe some others), the law is written in such a way that consular officers MUST assume that the application has "immigrant intent", e.g. they are intending to live in the USA permanently. YOU as the visa applicant have the burden to convince the interviewer that you are indeed intending to return to your country of origin.
Now, this burden is notoriously hard for young, unattached, marriage-age women to overcome, as they can simply get married on a tourist visa and become immediately eligible for adjustment of status to Permanent Resident (Green Card)...and this happens quite often. Some things that can work, are (as you already mentioned) having a job, home, car, and other attachments to your country.
The good news that a denial under 214(b) is not permanent and a previous denial doesn't influence future applications (although there are usually no grounds for appeal...you usually have to submit a new application).
If you want to help, the best thing that you can do is to contact your Congressman or Senator's office, and politely ask the staffer for a "letter of introduction" for your friend. This letter will simply be just that, a letter of introduction, and a statement that the Congressman/Senator is "interested" in the outcome of the case. It cannot directly order a result, but if everything else is in order, the interest of a member of Congress can often be enough to tip the application onto the "accept" side.
She succeeded at the interview today... she got the visa!
Just learned that now she’s denied again... bummer