I think the bruising is odd. I think the numerous calls are unstable.
I work in Special Ed. with some very volatile students. I've trained in and used several different crisis intervention programs and NONE have ever resulted in this type of bruising. As a special ed teacher, she may not be "licensed" for any physical intervention but she has way more training on this subject than the average teacher.
She flipped. She knows it and is scared. I'm darn sure she was told NOT to call you at all.
As a parent, I wouldn't want her jailed or necessarily fired but I'd like a suspension pending counseling and treatment plan. There are plausible circumstances in which she would deserve some understanding, but not a lot.