Both girls returned scores of six-over par 78 and are four shots clear of Kettering’s Charley Hull.
Elizabeth, 13, who plays at Sutton Coldfield, was runner-up in this tournament last year has just won the English schools U16 championship. She was one of the few girls to par the difficult 400-yard par four 17th.
Bronte, 12, plays at Bramhall and, like Elizabeth, is a member of an ELGA birdie squad. She got her round off to a great start with a birdie on the first hole and never had worse than a bogey on a hole.
Lianna Bailey, who at 10 is one of the youngest competitors in the field, had an eagle two in her round. The Rushcliffe player made short work of the 317-yard 10th when she holed a shot with a rescue wood. She finished with an 86 and a share of ninth place.
Emily Chan of South Herts leads the local challenge with an 87 which puts her in a share of 11th place.
After tomorrow’s second round the field will be cut to the leading 18 players and ties who will play the final 18 holes of the championship.
Leading scores: 78 Elizabeth Mallett (Sutton Coldfield Ladies), Bronte Law (Bramhall). 82 Charley Hull (Kettering). 83 Lauren Taylor (Rugby), Meghan MacLaren (Wellingborough). 84 Brogan Townend (Pleasington), Hannah Turland (Tidworth Garrison), Emily Taylor (Royal Lytham & St Annes). 86 Lianna Bailey (Rushcliffe), Alice Plumb (Yeovil).
Online scoring: www.englishladiesgolf.org
Fourth is no good enough