If you search the FreeBMD site
http://www.freebmd.org.uk/cgi/search.pl, you will find a birth record for Mary Taberer in Nuneaton registration district in 1852. Although the page number of the reference isn't clear, you could still order a copy of the certificate from Nuneaton record office with these details.
There are also likely birth/death entries for baby Charles and a death entry for Mary in Nuneaton in Dec Q 1894.
This looks like Mary on the 1871 census:
RG10/3169 - Folio 70 - Pg 19 Abbey St, NuneatonAustin Taberer Head 51 Tin Plate Worker b. Nuneaton
Ann Taberer Wife 48 Tallow Chandler b. Nuneaton
Mary Chandler Dau 18 b. Nuneaton
William Taberer Son 15 Chandler b. Nuneaton
Ann Taberer Dau 11 Scholar b. Nuneaton
Sarah J Taberer Dau 6 Scholar b. Nuneaton
Will look for her in 1861!
Rambler
PS Susan beat me to the post with FreeBMD!