Hello Alexander
I have had a look in St Margarets Leicester Parish Register for you and have found the baptism for Elizabeth Frignall as 19 March 1743
then ~~~~~~
Burials St Margarets
Anna Maria Frignall 12 August 1759 spouse Peter Frignall
then ~~~~~~~
Leicester & Leicestershire Marriages CD
Leicester St Margarets 26 March 1761
Peter Frignall of this parish
&
Elizabeth Boulton of this parish.... Spinster
By Banns
then ~~~~~~
St Margarets Parish Register
Burial 12 Oct 1774 Peter Fugnell
then ~~~~~~
Leicester & Leicestershire Marriages CD
Leicester St Margarets 7 Jan 1776
Thomas Walker (Widower) of this parish
&
Elizabeth Frignail (Widow) of this parish
By Banns
I cannot see the baptism of Peter 1749 in Parish Register, but here is his marriage record
Leicester St Margarets 2 April 1771
Peter Frignall of this parish Bachelor
&
Ann Smart of this Spinster
By Banns
Their children, records taken from St Margarets PR
John Frignall c 26 April 1772 parents Peter & Ann Smart sibling to Mary
Mary Frignall BIRTH 20 March 1775 parents Peter & Ann Smart sibling to John
All Saints Leicester PR
Elizabeth Fracknell c 11 April 1777 parents Peter & Ann
Ann Fracknell c 16 May 1779 parents Peter & Ann
Thomas Fracknell c 15 Jan 1784 parents Peter & Ann
Nessy Frignal c 13 April 1781 parents Peter & Ann
There are a couple of records which may have been mis transcribed and keeping a note of ;
St Margarets pr
baptism Peter Throsby 17 April 1749 father Peter (this maybe Peters Baptism)
Burial William Grignall 3 August 1776
Hope this helps
Bunnygirl