Queensland Premier Annastacia Palaszczuk has defended child safety minister Shannon Fentiman as "100 per cent committed to her portfolio" after a trip to a Byron Bay music festival on the weekend.

The opposition has criticised Ms Fentiman for heading to Splendour in the Grass on Saturday while areas of her department are "in crisis".

Child Safety Minister Shannon Fentiman. Credit:Chris Hyde

Her trip came after figures released last week showed almost two-thirds of child abuse investigations and assessments weren't taking place in recommended time frames.

Ms Palaszczuk said the minister had permission to attend a "family event" and made up for it by spending Sunday at work.