"It is a fantastic opportunity. I have always wanted to go to England ... and to go there and ride at Ascot, well that is just so wonderful," Allpress said.
Britain's best, Hayley Turner, 30, a Dubai Duty Free Shergar Cup regular who has ridden four winners in the competition in the past, will captain the Girls Team.
"I'm really looking forward to captaining the Girls Team again in an event I always enjoy and hopefully we can win it this year," Turner said.
Head of international racing at Ascot, Nick Smith, was particularly pleased Allpress had been included.
"We set the bar really high in 2012 with our first all female team, with Chantal Sutherland and Emma-Jayne Wilson [top US jockeys] competing alongside Hayley. So we are particularly pleased to have arguably the two outstanding riders in their countries - of any sex - in Rosie and Lisa, joining Hayley this year," Smith said.