Tame and Kristadb said exactly what I was going to say. Their advise is really sound.
I wanted to just add a little story here. I remember reading in the "Girlfriend's Guide To Pregnancy" a little quip about protective parenting and how each subsequent child is treated (this is paraphrased and from memory):
When the first child drops the binky (pacifier) on the floor, you run it through the dishwasher to make sure that it is nice and sterile.
When the second child drops the binky, you run it under some water in the sink and wash it.
When the third child drops the binky, you stick it in your own mouth, and then give it back to them.
The fourth child has to fish it out of the dog bowl themselves.
I remember when my daughter was young, there was this article on a TV show about child-proofing your house (of which I had done almost none), and they were talking about the door stops that are behind your doors in your rooms. They have this little "cap" on the end of the spring there. In the TV article, they were not only removing the cap (which just pulls off), but were removing the springs, too because kids could get their fingers pinched in them.
I have a girlfriend who had had a baby just a little earlier than me, and it was her THIRD boy. She was my "mommy" reference. I called her up all worried about this door stop thing. I told her that I had taken off the cap, but I didn't know what to do about the spring. She said, "do nothing". I said, "but what if she gets her finger pinched?!?". She said the words that have become my motto as a parent, "Well, she'll only do it once then, won't she?"
Children DO only do things once, when they find out that they are doing has a consequence they don't like!
Now, the limit here is if it is something that will put them in the hospital, however, a trip to the emergency room is a close call with regards to acceptability. I have to say, since that day, I have adopted the "she'll only do it once" rule.
We're outiside. We have a pool and are watching her crawl to the edge. OH NO!, my husband starts to reach for her. I stop him and tell him, "let her go. She'll only do it once". In she goes. Yup. From that point on, she knows what the edge of the pool is.
She's a cruiser. I tell her not to grab onto the magazine rack. She does it anyway, and promptly falls down amidst a bunch of magazines (now, keep in mind, I knew that it wouldn't her hurt if she fell). Wow. Amazing. She never did it again!
I go over to my friend's house and her now 2 year old is busy attempting to nail some house nails into a board that she had given him, with a full sized hammer. "Oh my goodness, Jodi, what if hits himself with the hammer?" Her response, "If he does, he'll only do it once". He never does.
Regarding the bruising, I hope that you can adopt some of that philosophy. The American Indians used to say that a child could never understand the fire without first putting their hand to the flame. It's a good thought.
Regarding the Mom thing, I'll just add this. You can not change her, you can only change the way that you react to her. If you don't like how she is babysitting your child, then you need to send your child to a caregiver that will respect your wishes because you pay them to do so.
Remember, your Mother isn't getting all worked up about this - she's fine. This is bothering YOU and you are the one who needs to change the situation if you so desire.
Same with the wedding.