Rachel does not wait upon God. She has got her own way of solving the problem.
One sin always leads to another, because we damage our conscience, and so it is easier to overcome its objections the next time. If you tell one major lie, then you can more easily tell another. But really, there is no such things as a small lie, though certainly, there are lies not repented of. Are there Christians and they have a major hatred against another? It will grow and soon lead on to another. They did not see this as an abhorrent act. It is the same with possessions. If I justify one large indulgence, then others easily follow. So it is not surprising when covetousness leads to adultery.