Because I am all kinds of petty, I'll do a breakdown of why her creams should just be a pot of cheap shea.
Ingredients: Butyrospermum Parkii, Simmondsia chinensis, Citrus Aurantium Dulcis, Charcoal, Avena Sativa, Nigella Sativa, Sesamum Indicum, Ribes Nigrum, Aquilaria crassna, Croton Lechleri, Zinc Oxide
Translation: Shea butter, jojoba, sweet orange, charcoal, oats, black seeds, sesame, blackcurrants, aquilaria crassna (tree), croton lechleri (a tree resin), zinc oxide
She's using the official names of things, which means things are a little vague in places as she hasn't specified if it's oil, powder, etc. I'm going off my own knowledge of the ingredients for the likely inclusions.
Shea butter- as we know, the main ingredient and likely to be 90% of the base for certification
Jojoba- likely to be jojoba oil, but could be jojoba butter. I doubt it though
Sweet orange- likely essential oil, and is her fragrance if I remember correctly. If it is, it's unlikely to be more than 1% of the total product due to regulation. Maximum 2%.
So, with that in mind and knowing cosmetic ingredients MUST be listed from highest to lowest percentage, there's 1-2% left to play with for the rest. You can list anything that is 1% and below in any order.
Charcoal and oats is likely powdered versions. Given the light grey colour of the creams, the charcoal inclusion is likely very low. Too much and it would be pretty dark. I can't imagine there's less than 1% of these two, though? This one has me stumped, unless she's not listing in order. I hope not, since that's against regulation, lol
Black seed and sesame are likely oils. Ribes Nigrum literally just is the name for blackcurrant, and I can't think why blackcurrant oil would be included, but that's also the likely suspect.
Croton Lechleri is a tree resin named dragon's blood. This does have science behind it, but the quantity she's using matters. I can't comment on it as a good/bad/neutral thing in her particular product for that reason.
Lastly, aquilaria crassna is a type of tree as well. I do wonder, however, if Zoe is aware that it's critically endangered? Unless she's using a synthetic, but that would go against the whole natural, plant based vibe she's got going on, lol. If she's using agar wood oil (also known as oud oil) from the tree, then her creams will likely have a kind of clove-ish woody scent. As far as I know they are orange scented. If it was scented with aquilaria crassna then it being low on the list makes more sense, but goodness. An odd choice if that's what she's done with it. I can't think of any reason to include oud oil in cosmetics outside of perfume, but I do admit my knowledge is limited on this ingredient.
In summary, going by the way ingredients must be listed, her creams ARE likely more than £2 to make. But, whether they need to be? I don't think so. None of the fancy things are seem to be in useful quantities, so why drive the price up with them unless you're using their listed properties as sale points? Oh wait. I think I've stumbled on the answer