Oh no, sorry, I didn't mean to imply she was. With your sister returning home that may have left an open conduit that attached to you because it couldn't have an opening? Which is me theorizing because we have so many different kinds of magic here. Supplementing with another source might be a good solution though. It won't break your connection with her but it will share the load to return to what you're used to?
No, what you're saying sounds like it absolutely makes sense. Magic is kind of like science so if you think of you and Zumulong as a circuit, what you're saying makes absolute sense.