What is happening?

Got her from Sam's 10 ish days ago. Potted her in topsoil (only unfertilised thing available). She gets full sun, I'm really trying not to overwater her. The plant already had the leaves when I got her, but it looks like she's struggling. She has had no new growth sinch I got her, and the existing leaves are drying up and falling off. What do I do?

Got her from Sam's 10 ish days ago. Potted her in topsoil (only unfertilised thing available). She gets full sun, I'm really trying not to overwater her. The plant already had the leaves when I got her, but it looks like she's struggling. She has had no new growth sinch I got her, and the existing leaves are drying up and falling off. What do I do?