Betts landed the prize after increasing the income of the charity's events department from £650,000 to £3.6m in just two years.
She was joined on the winner's podium by a host of other organisations, including Workplace Giving UK, which won the award for the Best E-media Campaign for its online payroll giving campaign, and the British Red Cross, which took the prize for the Best Telephone Campaign.
The Cancer Research UK Bobby Moore Fund partnership with clothes retailer Burton's landed the prize for the Best Business-Charity Partnership.
For smashing its target to boost the proportion of employees taking part in payroll giving to charities, the Arcadia Group took the prize for the Best Face-to-Face Campaign. Faber Maunsell won the award for Best Donor Acquisition Campaign, also for a payroll giving drive.
Forever Friends' CT scanner appeal took the Best Direct Mail Fundraising Campaign award. The Best Local/Regional Campaign was adjudged to be Sense Scotland's Making it Happen campaign.
Orbis and RSPB shared the award for the Best Donor Development Campaign. Deborah Roe of Spina Bifida won the Best Up and Coming Fundraiser, and Ken Deeks of KDL was Volunteer Fundraiser of the Year.