You've always given me very honest advice in the past, so I would like to return the favor.
First off, I'm sorry for the hard-times and your loses, I too just experienced the loss of my mother only a couple of months ago to lung cancer. It was unbelievably hard to bear, but just remember, life will always go on. Just keep your head up
That said, you need to wake up, and get out of this trance. Your daughter is just entering adolescent's, and there is no way you can morally sit back and allow ANYONE to do physical harm to her.
You need to document those injuries immediately, with pictures. And then take her down to the police station and fill a report.
It doesn't matter what any 9 year old does or says, there is NO way it's EVER right to hit them. It's a serious crime, and it should be. Child abuse is a horrific act.
Have you even considered the implications of not going to the police? How many times do you think he'll abuse her in the future?
Just like a doctor takes an oath to always do what's best for the patient; you must have taken an oath as a mother to always protect your children.
In addition, I would seriously consider getting your daughter to talk to a psychiatrist, or a psychologist. Things of this nature can have a very significant impact on a child's development, and open stays with them for quite some time.
Smarten up, and please do what's right.
If you need any help, PM me.
-VM