Her birth registration:

Surname   First name(s)      District   Vol  Page
Births Dec 1888   (>99%)
BARTHOLOMEW Beatrice Sarah    Newmarket 3b 501
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With her mother, uncle Robert Pettit and brother Robert in 1901 census.

Similarly with her uncle in 1911.  No occupation (apart from housework with her mother).
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No marriage can be clearly found for her from 1905 on, though I wonder if this might have been hers:

Surname First name(s) Spouse District Vol  Page
Marriages Jun 1917   (>99%)
Bartholomew Beatrice S Peters Luton 3b 747

No death found, though this is getting close:

Name Beatrice Peters
District Barnet, Hertfordshire
Date of Birth 1886
Page 0564
Volume 5A
Registered April - June 1954

as is this:

Surname First name(s) Age District Vol  Page
Deaths Mar 1953   (>99%)
PETERS Beatrice E 66 Gloucester R. 7b 627   
Deaths Jun 1954   (>99%)
PETERS Beatrice 68 Barnet 5a 564
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And I wonder whose births these were:

Surname First name(s) Mother District Vol  Page
Births Mar 1918   (>99%)
Peters Yvonne B Bartholomew Newmarket 3b  618
Births Dec 1925   (>99%)
Peters Olga A Bartholomew Newmarket 3b 655
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