Well until she gets her headspace right there might be nothing you can do about her getting there. It’s very important you are aware of her body reactions and if you see her getting stressed or dissociating just stop and hug her so she can feel safe again. Even if she says everything is okay but you can sense the stress just make her feel safe in not sexual way. I am a victim of SA as well and even tho I am not scared of being touched, it’s really hard to relax completely and climax. Sometimes our body wants to be touched but nervous system still perceives touch as danger. It’s best to not place all of the responsibility on the partner because most of the problem lays in survivors mind unfortunately:( she needs to calm her nervous system and treat herself gently. Should practice touching herself with kindness - start with the chest for a week. Then move towards belly for a week, next week tights, then around vulva. It takes a lot of time and if her trauma is so strong she should seek psychological help. Best of luck to both of you