Thank you Ksand24.... So on her Resident Permit she has a valid until date which is in Jan 2019. Is this it?
Sorry - just want to be 1000000% sure haha as we have been stressed about this lately!! 
Yes, that’s correct - the BRP is her visa.
If she applies by post, the package must be postmarked on or before that date in January.
If she applies in person, she must attend the appointment on or before that date in January.
To be safe, it’s best to either mail the package or attend an appointment a few days before the expiry date, at the latest.
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