The 1940 census is correct as the address 3353 "I" Street also appears on her father's death record.
There is a marriage 1940 for Margaret Florence Bell to William Collins. That could be her, although it would be good to find corroboration given how common the Bell surname is. Ancestry Record 61843 #623308960 - Newspapers.com obituary, requires subscription; for Margaret Florence Collins dies 20 Jan 1991.
Sources
↑ This information is given by her father in his 1915 naturalization application -- see his profile for citation.
1930 Census: "1930 United States Federal Census" Year: 1930; Census Place: Philadelphia, Philadelphia, Pennsylvania; Page: 21B; Enumeration District: 0954; FHL microfilm: 2341851 Ancestry Sharing Link - Ancestry Record 6224 #55934177 (accessed 7 June 2022) Margaret F Bell (15), single daughter, in household of Henry J Bell (50) in 923 E Ontario Street, Philadelphia, Philadelphia, Pennsylvania, USA. Born in Pennsylvania.
1940 Census: "1940 United States Federal Census" Year: 1940; Census Place: Philadelphia, Philadelphia, Pennsylvania; Roll: m-t0627-03721; Page: 11B; Enumeration District: 51-1056 Ancestry Sharing Link - Ancestry Record 2442 #24113061 (accessed 7 June 2022) Margaret Bell (25), single daughter, Bookkeeper, in household of Henry Bell (60) in Philadelphia, Philadelphia, Pennsylvania. Born in Pennsylvania.
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