This is oddThere is this Birth Record registered in 1915Mary Ellen EnderbyApr Qtr 1915Reg LeicesterVol 7aPage 205No Image availableI can't find the 1891 Birth Record on Ancestry for her Margp
Yet on freebmd the only possible marriage in Leicester of Edward Thompson to a Mary Ellen is to Mary Ellen E Tiday and no Enderby marriages at all that year in Leicester so it does look promisingI did wonder if the Lois Enderby who is lodging with them may have been the mother - but there's only 12 years between them so I doubt it (and her age matching with other census)