I don't see any real hints of a cure at this point in the narrative.

The fact that Mary does not feel equal to discussing with herself the pleasure she takes in Edmund's attentions could simply be because she is not in the habit of self examination or of thinking deeply about anything other than superficial and material matters.

Mary is so embedded in the worldly mindset of her London environment that it would take little short of an earthquake to make her change her values. It would be a huge leap for her to do so, and I question whether the quiet charm of Edmund's company would be enough to speedily provoke such a major change. I don't see it happening yet, at any rate.

"She did not think very much about it, however: he pleased her for the present; she liked to have him near her; it was enough."

I think the words in bold are important here. Mary is a sociable gal, and there are no other men around for her to be charming to and be admired by, so Edmund's attentions are better than nothing. He'll do for now.