Our dd had a hard time integrating french into her life, she understood french from a very early stage in her life but to speak also required confidence in herself and her surroundings even if others around her were speaking french! (the confidence thing was also a problem in the nursery school - so having a good spanish pre-school could really help with this sort of thing - we just don't have that sort of opportunity open to us). In our experience and certainly from what I can understand if the child is spoken to in french - or in spanish in your case - and said child responds in english then as long as the comprehension is there then all is well, the adult asking the question then repeats the childs answer in french and asks if that was what they meant and normally they will reply oui or yes!! Comprehension is half the battle and slowly the other gestures and learning of accents etc come with time - your dd is still young and has lots of time to learn - keep going and I'm sure all will be well. JFYI I speak ONLY english with dd, dh switches all the time between the two
- but then he's not speaking either language as a mother tongue so i guess it's not so important, both our children now are very fluent and obviously bilingual and often people will stop us in the street to tell us how wonderful it is - so keep it up - it's all good.