Well I did some looking for you for Florence Covert and I don't have her in any trees of mine so far.
Do you know if she had siblings and what their names were? We could try looking for them and maybe find her parents in the census's.
What I did do was go to https://www.familysearch.org/ and found the marriage license for Flo and Robert
You can download the origional copy of it there at that website its all free this section you do not have to log in to see the origional copy.... other records you do have to log in but its free.
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Pennsylvania County Marriages, 1885 - 1950
"Pennsylvania County Marriages, 1885 - 1950," Robert A. Leibert (1896) « Back to search results
View image Save image Search collection About this collection Name: Robert A. Leibert Titles & Terms: Event: Marriage Event Date: 08 Apr 1896 Event Place: , Butler, Pennsylvania Age: 22 Estimated Birth Year: 1874 Father: Theodore Leibert Father's Titles & Terms: Mother: Emelin Mother's Titles & Terms: Spouse: Florence M. Covert Spouse's Titles & Terms: Spouse's Age: 24 Spouse's Estimated Birth Year: 1872 Spouse's Father: Arnsy[hard to read it might be Armey, ???? Spouse's Father's Titles & Terms: Spouse's Mother: [Lizzy on the origional marriage license] Spouse's Mother's Titles & Terms: Reference Number: v 10 cn 3953 Film Number: 892804 Digital Folder Number: 4264883 Image Number: 431
Source Citation "Pennsylvania County Marriages, 1885 - 1950," index and images, FamilySearch (https://familysearch.org/pal:/MM9.1.1/VFMB-XRN : accessed 12 April 2012), Robert A. Leibert (1896).
I searched and searched for a Arnsy or Lizzy Covert in the 1880 census since Flo would be abt 8 going on the marriage info for her yr of birth and couldn't find one Arnsy Covert anywhere... no idea what his real name is either might be spelt the way it was heard don't know. Couldn't even find Flo in it either so either the surname is misspelled and its going to take a good dig to find her and parents.
All the census's info on Flo says she was br in Pa and both parents were also.be careful of census info as it is sometimes wrong people lie on it especially women as to their ages even on marriage info they will lie... and sometimes the person giving the info just might not know so they put what they think it correct.
You might try posting to the Covert surname messages boards and also the Butler Co Message board about the info in the marriage record found on her parents names.
I found both obits for Flo and Robert at the Butler library Obit data base at this website
On the left of the page is list of things they have go to the obit index put in their names and print out the info that pops up then you can either call the library and ask for the genealogy dept and ask them to send you the obits Flo's might tell her parents names.