Hi she applied for her settlement visa in Hong Kong which does have a priority service (recently introduced)
Here is the quote from UK Border site.

From February 8 2013 anyone making a UK visa application in Hong Kong can choose to use our priority visa service. This service is only available to applicants based in Hong Kong and is available for all visa categories.

Priority service applications will be placed at the front of the queue to be processed ahead of non-priority applications. The cost of this service will be $990HK for each non-settlement applicant and $3100HK for each settlement applicant. Use of the priority service does not imply or guarantee that your visa application will be successful. All visa applicants must meet the requirements of the UK Immigration Rules. The fee for the priority service and the visa application fee are not refundable if your visa application is refused.
Priority service processing times

Non-settlement applications: we aim to process all non-settlement priority visa applications within 3 to 4 working days.

Settlement applications: we aim to process all settlement priority visa applications within 10 working days.

also here is the link to that page:

http://www.ukba.homeoffice.gov.uk/co...e=UK%20English