Wow, your mum sounds like a bad person to be around right now. The things she said were incredibly insensitive at best and actively nasty at worst.
Surround yourself only with people you can trust, ask for and accept as much support as you can.
You can do this, you're in the home stretch now. You've been incredibly brave and strong, I bet you don't feel it, but you're a real hero. Heroes are people who display moral courage, and you have shown that you have it in spades.
Hopefully this bastard will receive justice for the horrific ordeals he has put you and your family through.
Can you perhaps plan something really nice for yourself for after the trial? Spending time with some supportive family or friends, or even something fairly trivial like a haircut or a massage.
Please make sure you look after yourself; little things like eating regularly, trying to get a good nights kip (easier said than done, I understand), taking a relaxing bath etc. You are going through an incredibly tough time and deserve some TLC.
Have you got a counsellor or therapist? If not, you may want to arrange to see one a couple of times after the trial is over. I imagine you'll be processing a lot of heavy emotions and need some support/sounding board. Perhaps a Rape crisis counsellor, or even just calling Women's Aid?
Keep posting, I'll watch this thread and be rooting for you on the 1st.