I have also had predominently nighttime IBS pain for the past seven years. My heart goes out to your daughter, I hope she gets some relief soon.
You mentioned that she eats bacon. That is a definite trigger for me and I've given up eating it, even in small amounts. Stir fried veggies would also give me a hard time because the vegetables are not cooked very much, plus the oil is hard to digest, but everyone is different. As you have probably seen on this forum, everyone has different trigger foods or foods they can tolerate with no problem.
Do you have almond milk in NZ? I really like the taste and I've recently found some hazelnut milk, which is delicious.
I think it's a good idea for your daughter to eat the soluble fiber first to get a "buffer" in her system before eating any protein or insoluble vegetables or fruit. I enjoy eating applesauce instead of raw apples - this seems to be less irritating for me. I'm totally avoiding "gassy" veggies like broccoli, brussels sprouts and cabbage and this seems to have alleviated my symptoms a bit. I used to like my veggies barely cooked, but now I cook them till they're soggy!
Foods like sweet potatoes, steamed fennel, well-cooked or canned asparagus, boiled celeriac root (cooked like mashed potatoes) are good alternatives for me.