Secret Love is #87 in the Pink Collection and was published in December 2011. Wenda is trying to keep Creswell Court going while her brother is in London, but they are both dismayed when the Prince of Wales announces that he's coming for a visit! They can't afford it but come up with a crazy scheme that brings love to both!
The second photo, which looks like a Francis Marshall cover, is the one listed on barbaracartland.com for this title!! I haven't found it on any earlier book and wonder if it was meant to be an alternate cover for A Gamble With Hearts?
This pink cover is identical to the UK cover of A Gamble of Hearts. http://barbaracartlandbooksandcoverart.blogspot.com/2009/06/gamble-with-hearts.html