The family name HEBER might have been written down and/or transcribed as WEBER, HEBERT, HERBERT, or other variations.
As lkessler's answer shows, the search at BAC-LAC allows you to specify not only the province but also the district and sub-district, as well as some information about the individual.
With people coming from non-English-speaking countries, it is often helpful to use wildcards and, paradoxically, as little information as you can to try to cast as broad a net as possible to catch the person, while limiting the results to a set that is manageable to step through.
Following lkessler's advice, I selected Province = Saskatchewan, District = 19, but I did not select a sub-district. Entering just Given Name(s) = Mary yields 1465 results, too many to step through. Entering Surname = Heber yields 0 results, so I backed off to just Surname = H*, which yielded 107 results. This is few enough to step through, but still there are multiple possibilities to check. One refinement to the search is to add Mary's age, which was somewhere between 27 and 29, so let's say 28. That brings the number of results down to 2, the first of which is:
Census Year: 1926
Item Number: 783765
Surname: Hebert
Given Name(s): Mary
Age: 28
Province: Saskatchewan
District Name: Humboldt
Sub-District Description: Townships 34 and 35 in range
25, west of the second meridian. Plunkett village.
This looks extremely promising, and clicking through to the image shows an ethnic Hungarian family of John (30), Mary (28), Mary (5), and Elizabeth (3) HEBERT, who immigrated in 1923. They are shown lodging with Jacob and Katie Gorski, not a Tittle family.