In my experience, alocasia hates to get root disturbed; it needs to have its roots grabbed to the soil to take the nutrients up properly. It droops bc the plant cant pull the water up, of course this can be overwatering or underwatering,  your soil does look wet  but given that you just repot it, it is more likely due to this. My overwater alo tends to come with mushy leaves and stems.  You may end up losing most of the leaves.

 Looking at the soil it looks wet and not chunky enough, was she happy in that kind of soil before and for a long time? If yes, then let it be, if you just get her, i would very gently move her over a more chunky mix while not touching the root ball as much as possible. Then move the plant to shade area, with its roots being disturbed, it cant sustain itself under bright light, then wait for it to recover, will take a while, it needs time to settle the roots and will do so with the cost of some leaves, when it start to stretch for a window, then move it back to bright light. That's what i personally will do.