I don't think I have read about St. Teresa levitating; but from the other things I know about her, I'd almost expect it. Here's what I believe.I have access to Catholic scholars --- 2 to be precise.
I still have to ask about levitation being demonic because someone mentioned St. Teresa levitating and brought this up.
I will also ask about Joachim da Fiore and this idea of man becoming perfect with time.
I can't remember much about it but thought, at the time, that it was an interesting idea but that it would not happen that way.
Resurrection is often seen as a single event; and while it's true that it can be seen that way; I think it is also a process that prepares each of us for that final dramatic event. The saint is involved in it.
John 1:12 But as many as received him, to them gave he power to become the sons of God, even to them that believe on his name:
If you can believe the bread and wine are really changed while still appearing as ordinary bread and wine to mortal eyes, the same type of change occurs in the body of the saint. When researching the idea of the Real Presence, I did more than look at the Bible and Tradition. I also noticed that certain types of miracles did not occur (with any frequency that I could discern anyway) outside the various original churches which still retain this doctrine.
The spiritual body is not something God is going to "create" later out of nothing. It is "sown in corruption" and the corruption takes on an incorruptible attributes. In this world, such transformations better kept hidden for the most part. Later however, the transformations made during this life will be revealed. Everyone will be able to see. (Then shall the righteous shine.) The spiritual body is not enslaved by gravity. The idea situation is to be able to make it lighter or heavier at will.
The easiest way to encourage this process is through Communion; but there are other ways too as we can see from the Old Testament.