It always moves me when I see a parent set aside their own agenda of hopes, dreams, fears and pain in favor of respecting their child's separateness. There is something embedded in the flesh of a parent that, at a basic and possibly subconscious level, wants to think of their child as an extension of them. A continuation of your history, your experiences, your values, and your yet unrealized dreams. Doesn't that sound lovely and poetic? The circle of life! Yeah, it's actual name is SIN. The compulsion to persuade, intimidate, manipulate or otherwise control someone else.
What I saw happening here was a mom who was ready to own her own fears, wounds, and anxiety and stop trying to force-feed in into her adult daughter. Luckily, she did it in time to preserve the relationship from long-term damage. Essentially she was saying, "I am scared, this reminds me of a time in my life when I made choices that I regret, but I am not you. You love Ryan, you trust him, and you know him better than I do. If this is what you want, and what you are going to do with or without my blessing, than I would like to honor your wishes and give you that blessing." Wahhhhh!
That may have been of the few times I have actually seen Sarah behave like a mature adult. And watching her remove that millstone from around her daughter's neck, the one she put there, was a beautiful moment.