Leader Danielle Smith says the changes are critical to restore public confidence.
Premier Alison Redford's Progressive Conservatives have put forward a bill that would give the chief electoral officer more latitude to investigate and report campaign finance problems.
But the government plans to keep the maximum $30,000 contribution limit for individuals, unions and corporations.
The bill also proposed the chief electoral officer be given authority to make his findings public from now on and going back three years.
Smith says the three years should be expanded to seven so more cases can be reported.
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