If it can't be stopped. She could at least try to work out a deal with anyone willing to help her. But that's if this is a cycle.

[Even if it is a sudden drain, a being of that kind of power might be more inclined to work deals. If only to spend fewer resources. Possibly.]

If she won't answer there might be evidence on the worlds we visit. She might just be harvesting from the same worlds over a period of time. Unfortunately, that's too early to tell.