Quote: There is another key difference we are 7 years apart.
Well you are right it may not be money. But unfortunately then it may be the famous "cherchez la famme", or the man, in your case. Is there somebody else? Somebody she started comparing you with?
Or, the 7 years age difference may be an issue. Why do you say "of course" its her being older? Normally it would be the other way round.
I think we will need more information to get a better view of your sitch. How old are u? How long have the two of you been together? She must have had other men before, how long was her last relationship before u came? How are u (and her) handling the age difference?