Good afternoon everyone. Yesterday I went to my grandparents and got this sad looking plant as a "gift"(a jasmine they called it). Any regard on what might me happening to it and how to address it??? My best guess is nutrient deficiency, so would some good fertilizer improve it??? They kept it under the shade of a tree and in a bucket that has some drainage holes. Ive also changed the soil for a better quality one (not the one that appears in the pictures). Should I prune it??? I live in western Texas, zone 8, btw.

Thanks in advanced...