It could be a few things.
First off, try leaving it for a few more days. In this exact crystallization I had no crystals in the first day, but after the 3rd day, The whole thing crystallized beautifully, leaving none left in solution.
Or, it could be your friend used too much IPA, in which, it will stay dissolved. Only way to recover it there would be evaporation, slow evaporation could leave you with nice crystals though.
Thirdly, it could be that your friends product in the extraction is not DMT fumarate. If its very impure, then it could be again you have too much IPA.
I would leave it for another day, if you still get nothing, then evaporate half of it, and stick it back in the freezer.
Expect nothing, Receive everything.
"Experiment and extrapolation is the only means the organic chemists (humans) currrently have - in contrast to "God" (and possibly R. B. Woodward). "
He alone sees truly who sees the Absolute the same in every creature...seeing the same Absolute everywhere, he does not harm himself or others. - The Bhagavad Gita
"The most beautiful thing we can experience, is the mysterious. The source of all true art and science."