Ask an Immigration Solicitor. Get an Answer ASAP.
Sorry to hear this.
UK immigration officers may refuse her entry if they think she is not a genuine visitor and does not have a visa in advance.
I am afraid they need to be convinced that she will return back home at the end of her visit and not end up staying here in the UK with you.
You can only wait and see what happens I am afraid. There is nothing you can do.
May I help further?
Yes, she needs a visa on arrival, not in advance as she is a non visa national.
Immigration officers have discretion whether or not to let her in.