Thank you for your question
My name is ***** ***** I shall do my best to help you.
You should apply to the Court for "Leave to remove" your daughter from the UK
You can read more here
In the circumstances there is no doubt that the court will give permission
Please ask if you need further details
Ther eis no concept of Custody in the Uk any more - which is why you need either the consent of the father or an Order from the Court
In your case I would expect three to four months at most