Did you do the breaking the cycle bit of the diet first? I know that when I did it I kept very bland and some of the things that you mentioned would definitely have upset me....
1. soup (my mum made from sweet potato, carrot and butternut squash)Does your Mum use a stock cube when she makes soup? If so it may have ingredients, anything from MSG (Which is EEEVIL) to garlic powder which hurt my tummy.
2. Blueberries, strawberries- strawberries give me LOTS of D I love them but have to have eaten lots and lots of solubles before I can chance having berries and getting away scot free.
3.dairy and wheat free choc- as far as i know it's still chocolate so still bad, but don't quote me on that. It's all pretty rich for a sick tummy.
I was on Colofac when I got IBS first and it really didn't help me at all, but I know some people swear by it.
The diet doesn't necessarily work immediately but it will work for most people so stick with it and maybe go blander? Keeping a food diary is such a good idea too.