MO - my DS is dairy and egg intolerant and I'm wheat intolerant. I can sympathise with the stomach cramps, as I get them myself. Not sure how you know that's what it is with 10month old, nor is 1 day forgoing a foodstuff enough to prove it is that foodstuff, but Mum's often know best, so here are my recommendations:
Cut out wheat and dairy (wheat intolerance is often exacerbated by dairy)
You can buy Rossisky rye bread in most supermakets (definitely Sainsbury's, Tesco's, Waitrose, quite possibly others). Most rye breads have wheat in, but this one doesn't. I must say it is quite a heavy bread so slice quite thinly for your DD. DS had this until he was about 20 months as we weren't sure whether he could have wheat, but he is fine on it.
There are lots of wheat-free breads, just look in the "free from" section in your local supermarket - but read labels, as many have dairy in and egg in (egg is the most allergenic food stuff apart from peanuts), so may be worth keeping that out of her diet to start with, just to test.
We give DS oatmilk - soya is also quite highly allergenic, so wouldn't recommend this for your DD being so young, oatmilk is easier digestion (shake box really well, to make sure you don't end up with sludge at the bottom.
Pure sunflower spread doesn't contain dairy or soya, so is a good one to try.
You may be lucky with goats milk, but those with dairy intolerances often can't take it either - I would suggest avoiding for first few weeks and then introduce to see whether it has an impact.
You will often need to cut out all allergenic substances for 7-10 days to be really sure they've cleared the system. Then after a month of so (possibly 2 weeks - I'm not a nutritionist or dietician), start reintroducing them one by one - introduce one and wait anywhere between 3-7 days for reaction, if no reaction you can continue giving it to her and then try another foodstuff.
Because of intolerances, reflux and eczema, DS lived on porridge (with oatmilk or his hypoallergenic formula), rye bread, meat, fish, veg and fruit until he was 20 months (with occassionally trying the allergenic substances to see if still reaction). From 20 months we were able to give him wheat knowing it had no impact. Still on no dairy or egg now - it causes eczema and funny tummy pretty much by next day or day after. After he got through weaning stage and maybe from 10-12 months, we would also give him Organics bars (no bad stuff in - find them in supermarkets in baby section, but I'm sure you know this! ), Nairn's oatcakes, including the berry fruit ones, which he likes as a snack. At the earlier stage your DD is at, he still used to have the Plum baby foods fruit purees, as he LOVED them, but he was also eating fruit cut up. I tell you, he ate so healthily, I wish I could do it for myself!
Once you get used to it, it's not that difficult really. You can use oatmilk and Pure sunflower spread in cooking. You can also get wheatfree flour in all supermarkets (again either look by flour, or in freefrom section), if you want to either make your own bread or goodies that DD can eat.
I hope that helps and doesn't sound preachy!
Quite often, if you cut the offending foods out now, children will grow out of intolerances within the first 5 years (DS showing no sign yet, but he's not bothered by it at this age!)