I have Horace David Burt (b. 1888 Hingham, Norfolk) WW1 service records, on this it states that he married Beatrice Kirby Windom 31st December 1916 Parish Church, Hingham (see image). I have brought up BMD record of this marriage for Horace ...Dec Q 1916 Forehoe Norfolk (Vol 4b pg 395) and cross referenced with the name Windom. The name on the corresponding BMD record is Elizabeth K Windom Taking this a bit further I have found a birth record for an Annie K Burt Dec Q 1921 Forehoe Norfolk (Vol 4b pg 302) which says mothers name Windom. (Horace and Elizabeth/Beatrice's daughter?)
I have searched censuses for Windom/ Windorn and other variations and drawn a complete blank for Elizabeth/Beatrice.........likewise with birth records
Another Horace D Burt was born at Forehoe in 1920. Mother's name Findon. Must be same couple. Possibly mispelt surname of Windom may have occurred in other documents too.
I have found in my family that the first and subsequent name used by family/spouse is completely different in in different official documents. She could have been baptised Elizabeth but always have been called Beatrice by her family or vice versa. Best bet is to get their marriage certificate and see what she signs as and what her father's name is. Then you have the option of searching for the father in the censuses.