I have trouble understanding some lines from this weeks reading. Could some one please explain the meaning?

1. ELIZABETH had settled it that Mr. Darcy would bring his sister to visit her the very day after her reaching Pemberley; and was consequently resolved not to be out of sight of the inn the whole of that morning. But her conclusion was false; for on the very morning after their own arrival at Lambton, these visitors came.

What does this mean? Did Lizzy expect Miss Darcy on the day of her arriving at Pemberley, or the day after? And, whose arrival at Lambton is she talking about here?

2. It was, on the contrary, exactly calculated to make her understand her own wishes; and never had she so honestly felt that she could have loved him, as now, when all love must be vain.