Just sharing my experience. Having had it BOTH ways.
For my first birth, sure, in theory if I KNEW my mom was going to be OK with it I would have had her there. What we had proposed was that she would stay with my sister (30 minutes away) and when labor started I would call her. However, we played it by ear. Frankly, labor was a lot more painful than I imagined...I was VERY vocal...and when the time came when the midwife asked me if I wanted to call my mom I said NO...and it was because I knew she couldn't have handled it and would have freaked out. Frankly speaking, the first time around you don't know HOW you are going to act during labor. You might be very vocal like I was...it make take a really long time...all sorts of things could happen which your mom's reaction could affect you. After all, if she isn't supportive of homebirth, chances are she is very uneducated about it and also is thoroughly niave about what natural birth is actually like. It make scare her...and frankly....you don't want to be thinking about ANYthing other than yourself and baby during your labor.
Anyhow...
For my second birth, having known what I do in labor the second time around my mom was MUCH more comfortable with homebirth. She had already met with the midwives the last time, gone for the post partum checkups with me, etc.. This time I could tell her that I was going to be loud, that I would be moaning (which helped me to get through the contractions). I went out of my way to show her some natural birth tapes. This time, I had her see the birth, however, the midwives asked her to come into our bedroom when I was pushing. My mom was there probably the last 5 minutes before she came out. And, she got to see me, not in pain, but as a birthing mama. That was what she could handle and that was what she needed...and at that point, I was so far deep into myself and my sensation that I wasn't even thinking about her.
I hope that that gives you some alternate ideas to think over. I really agree with the other women that it is far better, especially the first time around, to not have anyone there who isn't supportive and postive energy for you. I had only my good friend/doula, midwife and DH at the birth the first time around.
HUGS and try to rest up and take care of yourself, you will work all of this out in your mind

HUGS