You may not know that the burial records of Mount Pleasant are available on the Familysearch.org website under the record group Ontario, Toronto Trust Cemeteries, 1826-1989.
The records are digitized and partially indexed. For those records not indexed you are able to browse page by page.
An indexed search for Lilla Georgina Brown did not find any records. By browsing the 1932 record pages for Mount Pleasant, I found a burial record on page 18 # 56153 for a Lilla Georgina
Allen , age 60 who died in Whitby, Ontario on 14 April, 1932.
Here is the link for this record
Ontario, Toronto Trust Cemeteries, 1826-1989
Mount Pleasant Cemetery
Volume 05, 1931-1933
Image 18 of 43
https://familysearch.org/ark:/61903/1:1:276Q-YTRIf this link does not work, the record is indexed so on the search page simply enter the name as shown in the record.
Using the name Allen instead of Brown you can access her Ontario Death registration on the
Familysearch.org website under the record group Ontario Deaths, 1869-1937. This indexed
record group now provides a link to the actual death registration. On the document the name of her father appears as Charles Allen and her mother Mary Adelaide Brown. The informant is her brother Arthur E. Allen.
I hope this is the individual for whom you were searching and it helps in your research.
More study of the burial records may help you find other members of Lilla's family.