Randomstuff: I don’t normally post on Chat, but saw this in Active and wanted to respond. I’m so sorry this happened - especially for your daughter but for you too. It’s harrowing.
If you’d feel comfortable reposting this on the Women's Rights/“Feminist Chat” board, it would be appropriate and welcome and you might more quickly get responses from people who have done and do rape crisis and safeguarding work: www.mumsnet.com/Talk/womens_rights
One thing I’d say (as a rape survivor and as someone who has done some volunteer, but not professional, rape crisis work and anti-rape advocacy) is that responses to rape/sexual assault are extremely varied - be prepared for anything from her: grief and/or anger sure, and possibly self-blame - but there can also be denial, minimisation, even joking, etc. Sometimes even things that could seem inappropriate/shocking. It’s all part of the very individual processing of trauma.
Also, it’s often very hard for a recent rape survivor to have people she knows be aware of the situation. For some, it somehow makes it feel more “real”, less compartmentalised. If no one knows, you can go about ordinary life and then grieve and rage in private - but once someone in your "real life" knows... you worry that people you love, people close to you, will somehow see you “differently” even if they say otherwise. I’m absolutely not saying you shouldn’t talk to her, I think you have to. But do tell her up front that you respect her privacy, and that others (like your husband) don’t know, and won’t unless she wants their help/support.
Sometimes it’s also easier for a survivor to call a rape crisis hotline - where the caller’s identity is protected and she can hang up if it gets too uncomfortable. You might suggest this to her, if she shuts you down - just pass her local contact information and tell her it’s up to her to call or not when and if she’s ready, but that help is out there. If and when she needs it, she can get advice about any health concerns she may have, whether and how to report, if she wants (and what to expect), and how to protect herself if this person is a potential danger to her. Above all, remind her you’re always there for her if she wants to talk, even if she’s not ready now.