i think that youre missing the big picture of what is happening in your relationship.
your breakup/separation wasnt just over one small fight.
her reaction/cut off wasnt just because you shut off your phone for one hour.
all of this is happening in a vacuum.
as i said in your other thread, your ex is not in any state of mind to be a source of emotional support right now. it sucks. it isnt fair. but her problems are too big. think of it this way: if one of your parents just died, you wouldnt be in a place to be much support to someone else.
shes spending more time with her friends right now because those relationships are safer, and less emotionally loaded. as much as possible, to get on a better trajectory, you want to change that impression.
I sent her a text later last night saying I was sorry but I was in a bad place and couldn't see her or talk to her right then
leave it here when she doesnt respond. shes not in a place to hear explanations about why youre upset. you dont need to take all the blame for shutting your phone off for an hour.
these things are only increasing the sense of conflict between the two of you; its pushing her away. the first step in getting on a better trajectory is to stop the bleeding.
build a support system that is independent of her. you need your strength, and emotional balance.