My mother is a Belgian citizen, my child (11 months old) was born overseas, how to apply for Belgian citizenship for my child

Dear Friends :
I'm a Belgian citizen( since 20 th Feb 2020) , my 11 months daught was born overseas( She got her Belgium recidence in 10th March 2020) ; currenlty we're living in Brussels .
Accoding to Belgian nationality law; She meets the requirements for apply the Belgian citizenship；I went to the Nationality Office with our case , and the response was 'NO'. My daughter's situation is not eligible; Because her residency was after I acquired my nationality, she did not qualify for Belgian citizenship.
I'm very confused about the answer from Nationality Office ; Any one can give me a hand , i 'm appreciated with your advice .
anna

--Belgian nationality law ( as listed )
--On or after 1 January 1985
Belgian citizenship is acquired by:

birth in Belgium to a Belgian citizen OR;
One was born abroad AND:
1. the Belgian parent was born in Belgium or in Belgian Congo before 30 June 1960 or in Rwanda or Burundi before 1 July 1962 OR;
2. the Belgian parent was born abroad and makes a declaration, within a period of five years following the child's birth, requesting that he be granted Belgian nationality. This declaration (declaration d'attribution/toekenningsverklaring) must be submitted to the Belgian embassy or consulate in the main place of residence of the Belgian parent abroad, or the registrar in the parent's municipality (if the parent lives in Belgium). Belgian nationality is obtained on the date upon which the declaration is made.