200k in savings? OP, you clearly have NOTHING to worry about, other than a need to get married in order to ensure financial security. However, you do need to get this inferiority streak under control, and from what you're saying, it seems that your friend may indeed have people around her, who are jealous about her inheritance, and doesn't necessarily include you among them.
However, there is one question I would ask, ARE you untidy at home, as your friend seems to indicate with the things she's tagging you into, and more importantly, is your house actually clean? The reason I ask this, is that we had a friendship with another couple, all got on really well, although were aware that financially we were much better off, but that to us made no difference at all. However, the first time we visited their home, (they had come to ours for a long time, as we lived a long way away, and they liked coming to our area as it was a seaside location) we discovered that as expected in a poorer household, their furnishings etc, were a bit shabby, and worn, which again, didn't bother us one iota, but what did bother us, was that the house was FILTHY!! I'm afraid this totally put me off of them, because while money and possessions mean nothing to me, I'm afraid in my opinion there is no excuse for a home being dirty, and I'm not talking just not put the vacuum round, but toilets which were so gross you really wouldn't use them unless you were desperate.
So could this be the real reason why your friend prefers to invite you to hers OP, and nothing to do with her looking down on you about what you have or haven't got? Sorry if this is a bit blunt, but it's not something most people would be comfortable with saying face to face, for fear of causing offence, but it could be what she's trying to tell you in a roundabout way.