Identified! Canada - Rosedale, Toronto, BlkFem (Afr mix), 4-7, in constr dumpster, PMI sum/fall'21, 2 May 2022 - Neveah Tucker

[bombardier]

Is there a way to test for possible Covid after death?

if death was recent, definitely! we use the normal nasopharnygeal swab. once time has passed* and decomp sets in... i really doubt it. covid can survive on surfaces for several days (ive heard up to 28 days but idk what the conditions were) so i assume in a body, it would also act as a fomite and degenerate eventually. the presence of all that decomp bacteria might also make such tests invalid.
* i believe LE believe she died up to a year prior to being found