More than one language

I was just wondering how LOs being raised in more than one language are doing. My girl is exposed to Portuguese (me), Hungarian (dad) and English (we live in the UK). So far, she has a surprisingly extensive vocabulary in all 3 languages, but while building sentences she mixes them. We are trying to be consistent with our method (I only speak Portuguese to her and her Dad Hungarian). However, I wonder if anyone would suggest something else that could help. TIA ❤