Should I accuse my friend of being inconsiderate?
That's weird. Why do you think that your friend has been inconsiderate?
Because she did a bad thing to me, she did a bad job.
While it can be frustrating to deal with a close friend who is inconsiderate, it's not appropriate to directly accuse them of being so since it's argumentative and aggressive. Rather than accuse your friend and risk hurting your friend's feelings, you should try to have a calm discussion and raise the issue of what happened with the job that she did and how it made you feel. You can still get your point across without having to denigrate your friend's character.
I'm not sure if I should calm down or tell her that she's unreliable. I am just so angry.
You should calm down. You don't want to lose a friend  after accusing them. She will be so hurt that it could cause a lot of damage to your friendship.