Her baptism with birth transcript:

First name(s)           Henrietta
Last name               Powys
Birth year              1741
Birth date              19 Oct 1741
Baptism year            1741
Baptism date            13 Nov 1741
Father's first name(s)  Thomas
Mother's first name(s)  Henrietta
Parish                  St James, Piccadilly
County                  Middlesex
Country                 England
Archive                 City of Westminster Archives Centre
Record set              Westminster Baptisms

The text on the image on the Register page is:

[ St James Piccadilly  aka  St James Westminster ]

“Bapt                   November 1741                    Birth
.  .  .  .  
13   Henrietta Powys of Thomas Esqr and Henrietta   [born] 19 [Oct?]”
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Her burial transcript:

Title          Mis
First name(s)  Henrietta
Last name      Powys
Status         Daughter
Birth year     1741
Age            1
Death year     1742
Burial year    1742
Burial date    10 Dec 1742
Parish         St Peter
Place          Lilford
Denomination   Anglican
Residence      NTH
County         Northamptonshire
Country        England
Notes          d. 7 Dec, Tho: Esq High Sherif of N'hants & Henrietta
Extra text     Date of death given. Relation details.
Repository     Northamptonshire Archives
Event type     Burial
Burial unique reference identifier  B0536
Archive reference  194p/1
Record set     Northamptonshire Burials
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