Sounds like she is talking through a hole in her rear end. I double cheked on the IND website and can't see anything to suggest that what she says is correct:
Spouses, Civil Partners, Fiance(e)s and Proposed Civil Partners
How does my fiancé(e) or proposed civil partner, qualify to come to the United Kingdom?
Your fiancé(e) or proposed civil partner, must show that:
* you plan to marry or register a civil partnership within a reasonable time (usually six months);
* you plan to live together permanently after you are married or have registered a civil partnership;
* you have met each other;
* there is somewhere for him or her and any dependants to live until you are married or have registered a civil partnership without help from public funds; and
* he or she and any dependants can be supported without working or having to get help from public funds.
We will give your fiancé(e) or proposed civil partner, permission to stay here for six months but they must not work. After you have married or registered a civil partnership, your husband, wife or civil partner, may apply to stay here. If we approve the application, we will give your husband, wife or civil partner, permission to stay and work for 2 years. Near the end of 2 years, your husband, wife or civil partner, may apply to stay here permanently.
Your fiancé(e) or proposed civil partner, must get entry clearance before they travel to the United Kingdom