fish, If you read many posts in piecing you will see that a lot of the WASs approach full force and then pull back. I am not sure why this is other than them doubting themselves. I don't think their intent was ever to hurt us...and maybe that is why they pull back...for fear of hurting us again. They see us getting comfortable again and worry that they aren't 100% positive and don't want to give us false hope. I may not make any sense, but from what I have read it is very typical for them to pull back...especially after making a big step in the right direction. My H has done the same thing several times.
I don't think the message was too much. I think it is important to let them know that we care about them no matter what...maybe it takes some of the pressure off of them to know that we don't define our happiness by what they do or decide...but I would refrain from texting her too much more because you said yourself that she hates text messages. Yes, she started it and I think it was great what she said. Just remember that she is thanking you for your patience.
The eggshell feeling sucks but it does go away with time. That is the only thing that can make it go away...you can't rush it.