If youāve only been in flower for 5 weeks like youāre diary indicates - definitely no man itās not too late. Iāve had purple strains hit in the last 10 days. Usually itās like the last 2-3 weeks and flushing/ cold night time temps can help. But if itās truly in her genes/phenotype - sheāll show ya some regardless of flush and cold temps.
Iāve noticed the super dark purples tho, you usually see signs within the first couple weeks of flower.