I'm going to start a new thread on the Morlands' reaction to Catherine's arrival, etc., though others have partly discussed this below.
I too feel that Catherine's parents could safely have been a little *more* indignant about the way General Tilney treated their daughter, but I suppose that's a matter of POV.
When Mrs. Morland tells Catherine that having take care of herself on the journey home was good for her, and forced her not to be so scatter-brained, I could just hear my own mother saying similar things to me at that age! (And LOL to the prosaic "I hope it will appear that you have not left anything behind you in any of the pockets."!)
I'm somewhat disappointed by Mrs. Morland's reaction in ch.30, though. OK, fine, so it hasn't occurred to either of the Morland parents that their daughter might be in love, but I find Mrs. Morland's maternal intuition a little lacking when she doesn't realize that her daughter's unhappiness goes deeper than just missing the entertainments of Bath and Northanger Abbey (though I do find her plan to let Catherine read an instructive essay funny!). However, I had a mother who was quite intuitive, and I don't have kids myself, so perhaps I'm holding Mrs. Morland up to an unrealistic standard...