It all depends. Looks like sponsorship is out for you for the time being.
Is she under 31? She can get a Youth Mobility Scheme Visa, which is good for 2 years, but will have to return to her home country at the end of it.
Does she have an MBA? She may qualify for a Tier 1 work visa.
Does she have a BA, and a potential
UK employer? She may qualify for a Tier 2 visa.
Does she work for a company that has an office in England? She may be able to get a transfer with them.
Was at least one grandparent born in the UK? She may be eligible for an Ancestry Visa.
Take a look at this page, and click on the links:
http://www.ukba.homeoffice.gov.uk/worki ... mparisons/Hopefully that will help you.