Good conditioner for blond hair please

[feetheart]

DD (9) has beautiful thick long blond hair and bastard nits.

We had a great Herbal Essences conditioner a few years ago but when they changed the packaging they changed the formula and we haven't found one as good since. She currently uses my Aussie Everyday conditioner which is OK but as the bastard nits situation seems to be ongoing I'd like to find her one that really works well in her hair.
As DD is the only one with blond hair amongst our friends and family I thought I would consult the wisdom of MN.

TIA

Any good conditioner will do, but what ever you do don't get a conditioner for blonde hair 95% of the time they have heat activated lightning agents in them which will damage her hair x

That's great, thanks, never knew that.

Anyone from the evening crew?

Kerastase products are excellent.