On the Visa side.
I'm sure you're aware of the recent changes.
The full guidelines and rules have not yet been issued but in basic principle the major change relates to finances and the finance test.
As of July 9th 2012 the first requirement to meet is that of gross income.
You need to provide evidence of a total income minimum of £18600. This can be achieved in a number of ways.
Please take a look here APPENDIX B – MEETING THE FINANCIAL REQUIREMENT - page 39 to understand the rules.
also take a look at the examples on page 53 of the same link.
In principle all other requirements still largely follow those indicated in the thread here
Each visa application is reviewed and decided on it's own merits and previous student visa's will have no impact.
She will still need to take a pass an English test. This needs to be done with an approved UKBA provider.
There are any number of threads already on this forum and the UKBA website has the downloadable approved listing.
On occasion it's possible to be considered an exception to the rule, but this path is so complicated with many twists and turns and with fees to pay etc that almost
everyone considers it easier and cheaper to just take the test.
After your marriage she will apply for a spouse visa. This Visa will allow her to enter the UK and to seek and to take up employment immediately upon arrival.
I'm sorry to have set you a rather large reading task. Hopefully it will help you.
Don't be shy to ask any questions you still need clarification with. But please also understand that just now the new immigration rules effective from July 9
are not yet fully detailed so some changes may still yet appear.