I would bring up how you feel hurt in session. I would also not be too accusatory. Granted, I don’t know your T and the type of relationship you have but some of the things you wrote could be perceived as finger-pointing - which i think is not necessary. Why ‘invite’ a rupture when you are not exactly sure what is happening on her side. I would cut her some slack until you know for sure. After all, you have a 5 year relationship with her & say she’s been consistent and helpful up to now.

PS: I would also not ‘threaten’ to stop email - as again, you’re not really sure what is happening and although all your fears are triggered, you are assuming how she feels etc.

Reading your post, my first reaction was that maybe something is up with T (personal or whatnot) which might account for her being distracted, detached or not so much on the ball. So, although you feel the impact (e.g. feeling rejected or insecure etc.), it might not have anything to do with you.

She might simply have a lot on her plate and genuinely forgot the picture. You won’t know until you have a(n) (amicable) heart to heart. Tell her how you feel and perceive things and ask her if there is any validity to these (i.e. reassurance that you still have a strong relationship with her).