But all the same Bangladesh govt have basically denied she is a citizen and would refuse anywayNo, not to apply, it is automatic. It is why she was found not be stateless when her British citizenship was removed.
"The Commission in G3 (para 70) held that the aforesaid provisions make it manifest that citizenship by descent in Bangladesh arises at birth. This interpretation is also supported by the use of the phrases ‘shall be a citizen of Bangladesh by descent’ and ‘person claiming citizenship by descent’ in Section 5 of the Citizenship Act 1951 and Rule 9 of the Bangladesh Citizenship Rules 1952 respectively. Therefore, a person is automatically a citizen of Bangladesh at birth if either of his or her parents is a Bangladeshi citizen by birth (i.e. was born in Bangladesh)."
Shamima Begum may be a Bangladeshi Citizen After All
In 2015, Ms Shamima Begum, then a 15-year-old British citizen living in London, travelled to Syria to join the so-called Islamic State. Her fate was unknown until recently when Ms Begum was discovered in a refugee camp in Syria. On 19 February 2019, the British Home Office in a letter delivered...www.ejiltalk.org
The Citizenship Act, 1951 | 5. Citizenship by descent
bdlaws.minlaw.gov.bd
What you are saying is she has Bangladesh citizenship, but the govt say otherwise, she can’t get a passport or access to Bangladesh.
She may be theoretically a citizen of Bangladesh, but in practice not