Bonsai losing green leaves
I have what I believe is a jade bonsai which I have had about a year. Unfortunately I had to travel for work and a friend has been taking care of it. They kept it in a place that got filtered sunlight (not much I am afraid) and now that I am home it appears to have lost a lot of leaves (they fall off green and do not yellow or brown) and am not sure what to do. I have brought it home and am giving it better care but am unsure what to do. Any help is really appreciated. I am a bit afraid it was overwatered as well. ugh!