Oatly do an almost indecently good chocolate-fudge ice-cream, available in Tesco. The vegan Ben & Jerry’s flavours are made with almonds, but they contain some soya. Frustratingly, lots of sorbets [may] contain milk, though they absolutely shouldn’t.
Naturli is expensive well it is to me but it’s available as both a spread & as a block like REAL butter, & doesn’t have any soya in it.
Violife cheese is quite nice (should probably state here I’ve never had Real Cheese, but I know people who have who think it’s good) & is soya-free. It doesn’t melt in the same way Real Cheese does though...
If you’re cutting dairy & soya, not all oat/coconut/nut milks are as fortified as soya tends to be, so it’s sensible to supplement your DD’s vitamin D[3] (she may not have been absorbing it properly from dairy if she can’t process the foods properly in the first place) & make sure she’s getting plenty of calcium-rich foods in her diet. 400 Units/10mcg is the recommended daily dose of Vitamin D for children & there are heaps of supplements available. Optimising vitamin D levels will mean your DD then absorbs all of the calcium she needs from her diet - if her vitamin D levels get too low then that stops happening. Vitamin D deficiency can cause joint pain, too - and indeed horrendous fatigue. Was it something they checked when they did bloods? Vitamin D deficiency is ridiculously common in the UK, but...
It really is much MUCH easier to navigate allergies of all kinds now than it was even a few years ago: everything’s so clearly labelled & there are heaps of products easily available as well as a wealth of information online.
While you’re waiting to see the dietitian, if you’re not doing so already, keep a symptom diary; & a really detailed food diary. Don’t let your DD know about them though, you don’t want her worrying about any of this, starting to overthink everything her body does, nor to start thinking about food in any kind of unhelpful/unhealthy ways/becoming anxious about it - which a totally understandable focus on it by worried parents can inadvertently cause. A really detailed food diary is important for the dietitian because not only might they see things that you’ve not (it could be the soya is Not Guilty, for example, though obviously bloods are what you need to sort that out) it’s how they can best advise on how to support your DD’s nutritional status for optimal health & to help ensure you (& she) feel confident about managing a dairy-free diet.
(I have an anaphylactic dairy allergy & respond to frankly ridiculously small amounts, so have been doing this for a long time.)