I am the first to admit that Chick-Lit' is not my go-to choice of reading material but occasionally I like to dip my toe into the water and am sometimes pleasantly surprised. 
However on this occasion I was disappointed: the story felt too contrived and unbelievable in parts. I don't care how old your daughter is, I don't believe any mother would encourage them to stay in Vegas with a man they had only met two days before instead of returning to the UK with the rest of their family.
The 'Big Secret' that ran throughout the book, once revealed, wasn't really that big and I found the characters frustrating and annoying.