u/Ok_Fudge_2792

I am a new plant momma. I just got this pothos a little over two weeks ago. When I bought her there were some yellow leaves which I trimmed per google saying I should. However more leaves keep turning yellow/dying. The plant just does not seem to be happy. I got another pothos from the same store and she is very happy even sprouting some new leaves already. Both plants hang in a window and get watered once a week. How do I help make this plant happier? Also how much should I be watering a plant of this size on watering day?