Oh my goodness, yes ... I almost forgot about that. Delilah, in her own quiet way, really brings the funny at times.
Abby definitely is a special case. The person who would do anything for her friends and worry herself into a tizzy when they've taken ill, then would practically explode with joy at their good news ("This is the BEST. NEWS. EVER!!!!!") is the same person who can't keep that good news to herself, despite promises to the contrary. I think Tim and Delilah (and practically everyone else on the show in times past) gave her a pass because they know that it was just part of what makes Abby Abby ... in other words, her bad qualities are irritating, but more than made up for by the good in her.
Then again, I might be overthinking this.