The Special Immigration and Appeals Commission found all 3 had been made stateless and The Government had acted illegally and The Home Office decisions were overturned.
Something seriously wrong with the Special Immigration and Appeals Commission then - needs to be totally reformed or disbanded. Parliament can pass that as a law.
Anyway, she's married to a Dutch man, isn't she, who is the father of her child (who is also therefore entitled to be Dutch)? They can have her if Bangladesh doesn't want her.