Im sorry this is happening.

My first thought is she should realize a change in a boundary surrounding established support and comfort is best done gradually. There needs to be a lot of discussion. The new boundary needs to be fully explained. You need the opportunity to ask questions and explore how you feel about it...vent, if you need to.

I would feel angry and rejected, too, over such an abrupt change without discussing it first.
"That (perfect) relationship doesn't exist and I have to realize it and grieve it." ?
Are you kidding me? How cold!

My second thought is...it sounds like she made this all your fault. She has taken no ownership in it...whether she has created this new boundary because she realized it was too much for her, or whatever. She is the one who created the e-mail boundary in the first place. She has some blame if it has gone awry, doesn't she?

I may be wrong but I find it difficult to believe she changed the boundary only because it was in your best interest.