You dream refects your subconscious thoughts, your fear. However, that does not make the fear valid, just as that same fear in your conscious mind when you are awake is not valid simply because you think it.
It may or may not have any basis for your thinking ... could be you are just very insecure. Or, could be that your fears do have a basis in fact.
I agree, ask her about it and see what she tells you. Some "fess up" if so, some lie, some truthfully tell you its all in "your head." Then you will have to assess what she tells you and how you believe or doubt it and deal with that.
good luck,
ROB