Validation, variation and withdrawal of applications wrote:
(Page 24-5)
Void applications
An application is void when the Home Office cannot process it. For example an application for:
• limited leave to remain from a person who already has indefinite leave to remain
• applications for leave to enter or remain by those who are exempt from immigration control, such as members of the home forces or diplomatic staff - exemption is a matter of law
• leave to remain from a person who has their leave extended by 3C pending an appeal, unless the application is a human rights or protection claim – see: 3C guidance and for details on what applications are treated as human rights claims see the Rights of Appeal guidance
• an application for leave to remain from a person who is outside the UK without continuing leave a dependant’s application where the main applicant withdraws their application or varies their application to a route that does not allow for dependants
• an application made by a British Citizen or an Irish Citizen who does not need leave to enter or remain in the UK (see Common Travel Area guidance on Irish citizens) Common Travel Area
If the application is voided, it is my intelligent guess that the Home Office would have initially thought that the applicant (your daughter) was a British citizen by descent and therefore voided the application. What proof did you provide that you were a British citizen by descent and therefore your daughter is not a British citizen automatically? Did you at least provide a cover letter or explanatory note in the application explaining the situation?
It is likely that your application is bouncing around various parts of the Home Office (and likely at a senior level) with each team or office considering that it is not within their remit.
And calling the helpline won't do much. I work at a helpline (not the Home Office's, I hasten to add) and I can tell you that once an issue has gone above a certain level, it is probably easier just to talk to the walls or a stone for all the meaningful response that it will get you.
There is not much you can do at this stage. Probably instead of counting up the number of working days like a rosary, perhaps you should look at it in terms of working weeks or months.
I am not a lawyer or immigration advisor. My statements/comments do not constitute legal advice. E&OE. Please do not PM me for advice.