It is wonderful to hear that you are as supportive as you are and your feelings are natural.
I can tell you that the more you are there for her the faster she will heal.
To be completely honest, this is a traumatic experience and it will take a long time for the mental wounds to fully heal.
She could react in any number of ways afterwards but remember that no matter how traumatic it is to you, the male, she still has to deal with the rebalancing of hormones and social stigma and family members...
I am not saying you don't care as much as she does but it is a lot more physically and socially demanding for her.
She may come out without a single regret or she may freak out down the road or resent you since you are the man and it is easy to blame the provider of the sperm...
Just be soothing and "cope" with the emotional roller coaster until it finally slows to a stop.
As long as you are there to support her it will be a lot easier on both of you.
I, unfortunately, had an emotionally distant fiancé that couldn't cope with his own emotions let alone help me in my time of need. He was so callous that it was the way he treated me afterwards that caused me the trauma.
I already had ptsd from a bad childhood so I would be freaking about the procedure and have a flash back and he would just sit there and ignore me because it was too much for him to deal with.
Getting rid of him was the only way that I could come to terms with everything.
You sound like a wonderful person and it is wonderful that you will be there in the room with her!
I hope that they don't put her under full sedation but I also hope that they do more then giver her a single pain pill a half an hour before the procedure like they did with me at planned parenthood!
The pill didn't do a damn thing and it ended up hurting like hell!
Ok, enough of my ranting...
*hug* things will work out in the end! Just hug her when she needs it!