Are pre-packaged confinement herb soup safe for breastfeeding?

I just ordered a 30-day confinement herbs soup package from laobanniang as prep for my confinement. Informed my mum and she claims that I should not have bought them as these confinement soup packs include a lot of herbs and some of them are unsafe for consumption during breastfeeding. Zzzz. Is there any truth in this or is she just scaring me for nothing?