Interesting, I felt like Kate was dancing on knives, trying to make things good for Ellie and the baby, and off to a good start for her own little family overall. For me it felt like she was determined to go the extra mile to hold up her end and Ellie caught her offguard.
To me she just seemed irritated that Ellie wasn't happy and chipper. Ellie just went through a devastating loss and maybe she needs time to adjust, cry and heal. Kate just wanted to plan birthday parties and get togethers when Ellies heart had been ripped out. It was a happy day for Kate but a mournful one for Ellie. I think that was lost on Kate. I don't think they should have driven home together, LOL, they should have had someone else take Ellie home. That seemed like a bad idea. Adoption is built on loss and trauma and it was probably one of Kates happiest days in her life, but one of Ellies worst.