Multilingual Children

hi there. i’m looking for some insightful & encouraging words from others who are raising their children multilingually. i’ve a 15 month old girl who’s learning french, spanish, & english. her language input is divided almost equally between french & spanish & we speak english when interacting with the world at large. i’m a non-native french speaker & am wondering how other speakers handle situations when they do not know a word/phrase in their non-native tongue. i know about using the dictionary (& believe me, it’s a frequently used resource!) & i preview books so i can better read them in french. it’s just that previewing & referencing a dictionary aren’t always feasible or quick enough for the situation, so i tend to momentarily revert to either spanish &/or english. however, i’m not sure if this causes confusion or whatnot. any advice? thanks in advance!