Hi HolyAlchemy1, sorry to hear that your first figure had to be so traumatizing. It may help if you post some pictures of your Saber. Especially the connecting portion of the figure to the display base.
I hope you got this Saber from a reputable store because Saber (especially casual wear series of Sabers) is one of most bootlegged figures in the market. For your figure to display such severe leaning syndrome in a matter of hours and seemingly poor contact, the possibility of an bootlegged item is there. Do check out online reviews of the figure to see if there are glaring discrepancies between the product and the one in your possession.
As for correcting bent figures, I would have to disagree with the common method of using hot water (unless it is VERY bent, probably like yours). Softening the PVC and applying stress would seem like a good instant remedy but it actually weakens the structural integrity of the figure over time, eventually rendering it undisplayable. If your figure is legit and only beginning to bend, just pack it back into the box and 'rest' the figure. My experience have shown that the figure reverts to its original state after 2-4 weeks. Now when you return her to the display shelf, ensure the centre of her gravity is directly above point or axis of support. This may or may not be possible depending on whether or not the figure is screwed onto the base.
Just my 2 cents. All the bless for your Saber.