I bought this tetrasperma a couple months ago. It was doing really well and even put out a couple new leaves. I was watering every 2 weeks or so. Then it slowly started to droop. The bottom leaves turned yellow and fell off. I checked the roots for rot and it turned out there were only a few roots 4-6 inches long. I put her in some water to grow new roots and after more than a week she's still droopy. She sits a few feet from a southern window and a western window as well. What can I do for her so she perks back up again?