Habitant split pea soup would be a good one too - if she likes it. Canadian. Brand and very Canadian soup.
Bottled donair sauce might be funny too if she likes that.
A lot of foods are so regional (just like most things Canada). So I suppose it depends on where she’s from and where you’re travelling from. The, of course, there’s the veggie and fruit and baked goods and regional meat dishes/casseroles and desserts. but you don’t want to deal with border crossing of those.
Pretty much anything Nestle or Cadbury in Terms of candy and chocolate bars would be harder to find down there. Caramilk? That’d be a good one. Aero is another one you can’t find. Gangon (if you’re on or from the east coast) would be non existent. I know a lot of New Brunswickers who even else where in Canada who ask for “chicken bones” be brought (especially around the holidays). Mr big could be a vs O Henry debate (though I think the Americans would win on that one). Big Turk, Cherry Blossom, Crunchie (that’s usually a hit with people who’ve never had it before even if they hate it it’s just so different). Glossetts could be added to the “better then M&Ms” debate. I think “bridge mix” is also a Canadian thing.
Kraft doesn’t sell peanut butter down there is my understanding. So if that’s a staple for her having the Canadian brand/consistency/recipe might be a treat.
A lot of things you can get but they’d use a different formulation due to different rules about food, etc. KD would be on that list. I’ve heard of others but I’m blanking. Oh. You might want to ask about her experience with American jelly vs Canadian jam. She might be craving some Smuckers for her toast. To add to her breakfast, I’m not sure if you can get them Dow there but they are definitely Made in Canada - Shreddies. If she’s a cereal person. And if she’s a tea person - Red Rose. I know people who when they move (even within Canada, I think it might be another east coast thing) miss a Red Rose tea.
With chips, Old a Dutch and Hawkins are brands they can’t get. I’ve heard that Dill Pickle, Ringolos and Hickory Sticks are hard to find in the US too. Any of the weird PC “world of flavours” too. Like poutine or donair, etc.
If you’re looking for a splurge gift, a Roots hoodie or sweats would always be good. Lululemon too.
And if you’re looking for little pins, stickers, flags, etc., your MP and MPP/MLA should like to able to give you a few, if you ask and explain why (cultural ambassador/exchange). Then you’d have Canada and your(/her) province.
Indigo as a box set of “the world needs more Canada”/“read Canada” books on their discount racks now. It’s all Canadian authors and was put out for the 150th. If she’s a reader it might be fun. It looked like they have a “young readers” collection and an adult. I think they are about $15-20 now. They were cheap enough that I stood there for a while thinking about picking some up as Christmas gifts.
Anything with CBC on it might be fun too. They have a lot of branded “retro” clothing/tees. They have the bags, purses, etc at Indigo but they are very expensive as it’s the Red Canoe brand. They have RCMP stuff there too.
A playlist of some Canadian music/bands might be fun for her to share too. Or bi ge worthy tv shows (Orphan Black, Wyonna Earp, Letterkenny, etc)