Thanks for your input.
She does need a visa to Schengen countries. Unfortunately it is not possible to travel with COA back to the UK as no airline accepts it as valid in immigration status. (This has been raised by many people before in similar situation).
My question is more specific as to which countries recognise civil/durable partnership for Schengen visa purpose.
I have contacted SOLVIT who gave specific advise in regards to France.
If she is not a registered civil partner or spouse, she is nevertheless, entitled to have her entry facilitated as a "durable partner".
As she is not a registered civil partner or spouse, the French authorities do not entitle her to apply for a visa described as a "Visa for a Family Member of an EEA National". She must apply for an ordinary short-stay visa.
So I would like to know if anyone is aware as to which countries facilitate entrance for durable partners.