بعد 6 أيام من زفاف أختها، ماذا حدث ليدها؟

The problem is not the henna dye itself but the chemical para-phenylene diamine (PPD) which is sometimes added to make the tattoo darker

u mean this is atopic ( allergic ) dermatitis or irritant contact dermatitis?

I vote irritant contact dermatitis

am not sure but i think allergy requires less than 6 days to appear
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For those interested

Allergic contact dermatitis

http://dermnetnz.org/dermatitis/pdf/allergiccontactdermatitiscontactalle...

Irritant contact dermatitis

http://dermnetnz.org/dermatitis/pdf/irritantcontactdermatitis-dermnetnz....