My son turned 3 in April this year. They start admissions very early - like all Montessori schools, they admit children from the age of 2. Therefore, anytime after that, admission is subject to availability.
They admit children three times a year - in June, September and January. I had taken an application form in February, at which time I was too late for the June admissions. I am told that they give out application forms only if there are vacancies.
I was able to submit an application form, and now the wait is still on. I am hoping they'll call us sometime in June/July.
I had spoken to an Abacus parent a while back - she told me that persistence helps, and she advised me to persist at following up with them. She had similar problems as yours, she could not get an application form, she eventually did get one, submitted it, and after a lot of persistence (personal visits, phone calls), she was told - 'please do not call, we will call you ourselves'. A full year later, they did call her and give her son an admission.
All the best with your daughter's admission!